American Axle & Manufacturing (AXL) 10-Q/A 23 Feb 15 2014 Q3 Quarterly report (amended) Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	9 Months Ended
	Sep. 30, 2014	Oct. 29, 2014
Entity Registrant Name	AMERICAN AXLE & MANUFACTURING HOLDINGS INC
Entity Central Index Key	1062231
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Document Period End Date	30-Sep-14
Amendment Flag	FALSE
Document Type	10-Q/A
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding		75,757,139
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net sales	$950.80	$820.80	$2,756.50	$2,376
Cost of goods sold	810.1	695.5	2,344.90	2,024.20
Gross profit	140.7	125.3	411.6	351.8
Selling, general and administrative expenses	64	57.8	182.6	177.9
Operating income	76.7	67.5	229	173.9
Interest expense	-25.1	-30	-75.2	-87.9
Investment income	0.7	0.1	1.3	0.4
Other income (expense)
Debt refinancing and redemption costs	0	0	0	-11.2
Other, net	-0.8	0.1	0.5	-1.4
Income before income taxes	51.5	37.7	155.6	73.8
Income tax expense	7.5	6.1	25.8	9.1
Net income	$44	$31.60	$129.80	$64.70
Basic earnings per share	$0.57	$0.41	$1.68	$0.84
Diluted earnings per share	$0.57	$0.41	$1.68	$0.84

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$44	$31.60	$129.80	$64.70
Other comprehensive income (loss), net of tax
Defined benefit plans, net of tax	0.6	15.1	6.3	15.7
Foreign currency translation adjustments	-23.3	2.5	-11.9	-14.3
Change in derivatives	-2.5	-0.6	-1.1	-2.2
Other comprehensive income (loss)	-25.2	17	-6.7	-0.8
Comprehensive income	$18.80	$48.60	$123.10	$63.90

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME PARENTHETICAL (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other comprehensive income (loss), pension and other postretirement benefit plans, tax	($0.30)	($7.90)	($3.20)	($8)

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets
Cash and cash equivalents	$219	$154
Accounts receivable, net	600.2	458.5
Inventories, net	249.2	261.8
Prepaid expenses and other current assets	110.8	122
Total current assets	1,179.20	996.3
Property, plant and equipment, net	1,066.70	1,058.50
Deferred income taxes	327.7	341.8
Goodwill	155.6	156.4
GM postretirement cost sharing asset	233.9	242
Other assets and deferred charges	264.8	232.5
Total assets	3,227.90	3,027.50
Current Liabilities
Current portion of long-term debt	17.1	0
Accounts payable	496.3	437.4
Accrued compensation and benefits	102.7	110.1
Deferred revenue	22.2	17
Accrued expenses and other current liabilities	100.2	94.2
Total current liabilities	738.5	658.7
Long-term debt	1,525.50	1,559.10
Deferred revenue	101.4	76.4
Postretirement benefits and other long-term liabilities	690.9	692.8
Total liabilities	3,056.30	2,987
Stockholders' equity
Common stock, par value $0.01 per share	0.8	0.8
Paid-in capital	621.1	612.8
Accumulated deficit	-44.6	-174.4
Treasury stock at cost, 6.1 million shares as of September 30, 2014 and 6.0 millions shares as of December 31, 2013	-182.8	-182.5
Accumulated other comprehensive income (loss), net of tax
Defined benefit plans	-191.6	-197.9
Foreign currency translation adjustments	-30.5	-18.6
Unrecognized gain (loss) on derivatives	-0.8	0.3
Total stockholders’ equity	171.6	40.5
Total liabilities and stockholders' equity	$3,227.90	$3,027.50

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, except Per Share data, unless otherwise specified
Common stock, par or stated value per share	$0.01	$0.01
Treasury stock, shares	6.1	6

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating activities
Net income	$129.80	$64.70
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	146.1	129.4
Deferred income taxes	6.8	-1.3
Stock-based compensation	7.1	9.8
Pensions and other postretirement benefits, net of contributions	0.6	11
Gain on disposal of property, plant and equipment, net	-4	-3.7
Debt refinancing and redemption costs	0	2.5
Changes in operating assets and liabilities
Accounts receivable	-142.5	-135.7
Inventories	12.3	-30.1
Accounts payable and accrued expenses	68.4	111
Deferred revenue	31.1	-7.8
Other assets and liabilities	-24.1	-47.5
Net cash provided by operating activities	231.6	102.3
Investing activities
Purchases of property, plant and equipment	-156.2	-178.2
Proceeds from sale of property, plant and equipment	8.5	5.8
Proceeds from sale-leaseback of equipment	0	23.5
Net cash used in investing activities	-147.7	-148.9
Financing Activities
Net short-term repayments under credit facilities	-3.1	-8
Payments of long-term debt and capital lease obligations	-16.4	-308.6
Proceeds from issuance of long-term debt	2.8	432.4
Debt issuance costs	-0.3	-12.9
Purchase of treasury stock	-0.3	-0.4
Employee stock option exercises	1.2	0.8
Net cash provided by (used in) financing activities	-16.1	103.3
Effect of exchange rate changes on cash	-2.8	-0.5
Net increase in cash and cash equivalents	65	56.2
Cash and cash equivalents at beginning of period	154	62.4
Cash and cash equivalents at end of period	219	118.6
Supplemental cash flow information
Interest paid	63.7	85.8
Income taxes paid, net of refunds	$9	$9.50

Organization_and_Basis_of_Pres

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Organization and Basis of Presentation [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. ORGANIZATION AND BASIS OF PRESENTATION
	Organization  American Axle & Manufacturing Holdings, Inc. (Holdings) and its subsidiaries (collectively, we, our, us or AAM) is a Tier I supplier to the automotive industry. We manufacture, engineer, design and validate driveline and drivetrain systems and related components and chassis modules for light trucks, sport utility vehicles (SUVs), passenger cars, crossover vehicles and commercial vehicles. Driveline and drivetrain systems include components that transfer power from the transmission and deliver it to the drive wheels. Our driveline, drivetrain and related products include axles, chassis modules, driveshafts, power transfer units, transfer cases, chassis and steering components, driveheads, transmission parts and metal-formed products. In addition to locations in the United States (U.S.) (Michigan, Ohio, Indiana and Pennsylvania), we also have offices or facilities in Brazil, China, Germany, India, Japan, Luxembourg, Mexico, Poland, Scotland, South Korea, Sweden and Thailand.
	Basis of Presentation  We have prepared the accompanying interim condensed consolidated financial statements in accordance with the instructions to Form 10-Q under the Securities Exchange Act of 1934.  These condensed consolidated financial statements are unaudited but include all normal recurring adjustments, which we consider necessary for a fair presentation of the information set forth herein.  Results of operations for the periods presented are not necessarily indicative of the results for the full fiscal year.
	The balance sheet at December 31, 2013 presented herein has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America (GAAP) for complete consolidated financial statements.
	In order to prepare the accompanying interim condensed consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts and disclosures in our interim condensed consolidated financial statements.  Actual results could differ from those estimates.
	For further information, refer to the audited consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2013.
	Restatement of Prior Period Financial Statements In connection with the preparation of our consolidated financial statements for the year ended December 31, 2014, we determined that entries recorded in the third quarter of 2014 to reduce certain accrued accounts payable balances by $8.4 million were originally recorded as a reduction of cost of goods sold but should have been recorded as an adjustment to opening accumulated deficit because the amounts giving rise to the correction originated in periods prior to January 1, 2012. While management determined that it was necessary to restate the September 30, 2014 interim period, the effect of correcting these errors was not material to opening accumulated deficit as of January 1, 2012.
	As shown in the tables below, the effect of the correction of this error was a decrease of $6.9 million in opening accumulated deficit as of January 1, 2012, which resulted from a reduction in accounts payable of $8.4 million and a decrease in deferred tax assets of $1.5 million. The impact of the correction of this error for the three and nine months ended September 30, 2014 was an increase in cost of goods sold of $8.4 million, a decrease in income tax expense of $3.8 million and a decrease in net income of $4.6 million.
	The following tables present the effects of the restatement on the previously issued financial statements presented herein.
		Three Months Ended									Nine Months Ended
		30-Sep-14									30-Sep-14
		(in millions, except per share data)
		As previously reported			Adjustment			As restated			As previously reported		Adjustment			As restated
	Condensed Consolidated Statements of Income (Unaudited)
	Cost of goods sold	$	801.7		$	8.4		$	810.1		$	2,336.50	$	8.4		$	2,344.90
	Gross profit	149.1			(8.4		)	140.7			420		(8.4		)	411.6
	Operating income	85.1			(8.4		)	76.7			237.4		(8.4		)	229
	Income before income taxes	59.9			(8.4		)	51.5			164		(8.4		)	155.6
	Income tax expense	11.3			(3.8		)	7.5			29.6		(3.8		)	25.8
	Net income	48.6			(4.6		)	44			134.4		(4.6		)	129.8
	Basic earnings per share	$	0.63		$	(0.06	)	$	0.57		$	1.74	$	(0.06	)	$	1.68
	Diluted earnings per share	$	0.63		$	(0.06	)	$	0.57		$	1.74	$	(0.06	)	$	1.68
	Condensed Consolidated Statements of Comprehensive Income (Unaudited)
	Net income	$	48.6		$	(4.6	)	$	44		$	134.4	$	(4.6	)	$	129.8
	Comprehensive income	23.4			(4.6		)	18.8			127.7		(4.6		)	123.1
	Condensed Consolidated Statements of Cash Flows (Unaudited)
	Net income										$	134.4	$	(4.6	)	$	129.8
	Deferred income taxes										10.5		(3.8		)	6.7
	Accounts payable and accrued expenses										60		8.4			68.4
		30-Sep-14
		As previously reported			Adjustment			As restated
		(in millions)
	Condensed Consolidated Balance Sheet (Unaudited)
	Prepaid expenses and other current assets	$	108.5		$	2.3		$	110.8
	Total current assets	1,176.90			2.3			1,179.20
	Total assets	3,225.60			2.3			3,227.90
	Accumulated deficit	(46.9		)	2.3			(44.6		)
	Total stockholders' equity	169.3			2.3			171.6
	Total liabilities and stockholders' equity	3,225.60			2.3			3,227.90
		31-Dec-13
		As previously reported			Adjustment			As restated
		(in millions)
	Condensed Consolidated Balance Sheet
	Prepaid expenses and other current assets	$	123.5		$	(1.5	)	$	122
	Total current assets	997.8			(1.5		)	996.3
	Total assets	3,029.00			(1.5		)	3,027.50
	Accounts payable	445.8			(8.4		)	437.4
	Total current liabilities	667.1			(8.4		)	658.7
	Total liabilities	2,995.40			(8.4		)	2,987.00
	Accumulated deficit	(181.3		)	6.9			(174.4		)
	Total stockholders' equity	33.6			6.9			40.5
	Revenue Recognition In the first quarter of 2014, we reached an agreement with General Motors Company (GM) to increase installed capacity and adjust product mix for our largest vehicle program. As a result of this agreement, we received $27.5 million in the first nine months of 2014 and recorded a receivable for the remaining $6.9 million that we expect to receive in the fourth quarter of 2014. We initially recorded deferred revenue of $34.4 million related to this agreement. We will recognize this deferred revenue into sales over the life of the program on a straight line basis over approximately 5 years, which is the period we expect GM to benefit from this capacity and mix change. In the first nine months of 2014, we recognized revenue of $3.9 million related to this agreement. As of September 30, 2014, we have $7.2 million of deferred revenue that is classified as a current liability and $23.3 million of deferred revenue that is recorded as a noncurrent liability on our Condensed Consolidated Balance Sheet.
	Also in the first quarter of 2014, we reached an agreement with GM to recover certain costs related to the delay of another major product program. We received $9.3 million in the first nine months of 2014 related to this agreement and initially recorded deferred revenue of $9.3 million. We will recognize this deferred revenue into sales over the life of the program on a straight-line basis over approximately 8 years, which is the period we expect GM to benefit from this agreement. We began recognizing this deferred revenue as revenue in the third quarter of 2014 when this program launched in certain markets. In the first nine months of 2014, we recognized revenue of $0.3 million related to this agreement. As of September 30, 2014 we have recorded deferred revenue of $9.0 million, $1.1 million of which is classified as a current liability and $7.9 million which is recorded as a noncurrent liability on our Condensed Consolidated Balance Sheet.
	Effect of New Accounting Standards On January 1, 2014, new accounting guidance became effective regarding financial statement presentation of an unrecognized tax benefit when a net operating loss (NOL) carryforward, a similar tax loss, or a tax credit carryforward exists. The new guidance requires entities to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for an NOL carryforward, a similar tax loss, or a tax credit carryforward, except when one is not available as of the reporting date or the entity does not intend to use the deferred tax asset for this purpose. This guidance does not affect the tabular reconciliation of the total amounts of unrecognized tax benefits, as the tabular reconciliation presents the gross amount of unrecognized tax benefits. The adoption of this new guidance has had no impact on our condensed consolidated financial statements.
	In May 2014, new accounting guidance was issued that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The guidance is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.  The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract.  Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard.  This guidance becomes effective for AAM at the beginning of our 2017 fiscal year and early adoption is not permitted.  We are currently assessing the impact that this standard will have on our consolidated financial statements.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2014
Inventories [Abstract]
Inventory Disclosure [Text Block]	2. INVENTORIES
	We state our inventories at the lower of cost or market.  The cost of our inventories is determined using the FIFO method.  When we determine that our gross inventories exceed usage requirements, or if inventories become obsolete or otherwise not saleable, we record a provision for such loss as a component of our inventory accounts.
	Inventories consist of the following:
		September 30, 2014			December 31, 2013
		(in millions)
	Raw materials and work-in-progress	$	252.4		$	263.4
	Finished goods	29.1			25.7
	Gross inventories	281.5			289.1
	Inventory valuation reserves	(32.3		)	(27.3		)
	Inventories, net	$	249.2		$	261.8

LongTerm_Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2014
Long-term Debt, Unclassified [Abstract]
Long-term Debt [Text Block]	3. LONG-TERM DEBT
	Long-term debt consists of the following:
		September 30, 2014		December 31, 2013
		(in millions)
	Revolving Credit Facility	$	—	$	—
	Term Facility	144.4		150
	7.75% Notes	200		200
	6.625% Notes	550		550
	6.25% Notes	400		400
	5.125% Notes	200		200
	Foreign credit facilities	43.2		53.8
	Capital lease obligations	5		5.3
	Debt	1,542.60		1,559.10
	Less: Current portion of long-term debt	17.1		—
	Long-term debt	$	1,525.50	$	1,559.10
	Revolving Credit Facility and Term Facility As of September 30, 2014, the revolving credit facility provided up to $523.5 million of revolving bank financing commitments through September 13, 2018.  At September 30, 2014, we had $505.5 million available under the revolving credit facility.  This availability reflects a reduction of $18.0 million for standby letters of credit issued against the facility. We paid remaining debt issuance costs of $0.1 million in the first nine months of 2014 related to the revolving credit facility and term facility.
	The revolving credit facility provides back-up liquidity for our foreign credit facilities.  We intend to use the availability of long-term financing under the revolving credit facility to refinance any current maturities related to such debt agreements that are not otherwise refinanced on a long-term basis in their local markets, except where otherwise reclassified to current portion of long-term debt on our Condensed Consolidated Balance Sheet.
	In the first nine months of 2014, we made principal payments of $5.6 million on our term facility.
	In the first quarter of 2013, we terminated our class C loan facility of $72.8 million, which would have matured on June 30, 2013. Upon termination, we expensed $0.5 million of unamortized debt issuance costs related to the class C facility. We had been amortizing the debt issuance costs over the expected life of the borrowing.
	6.25% Notes In the first quarter of 2013, we issued $400.0 million of 6.25% senior unsecured notes due 2021 (6.25% Notes). Net proceeds from the 6.25% Notes were used to purchase and redeem the entire $300.0 million outstanding of our 7.875% senior unsecured notes due 2017 (7.875% Notes) and for other general corporate purposes. We paid debt issuance costs of $6.6 million in the first nine months of 2013 related to the 6.25% Notes.
	7.875% Notes In the first quarter of 2013, we expensed $8.5 million related to tender and redemption premiums, $0.1 million of professional fees and unamortized debt issuance costs of $2.1 million related to the purchase and redemption of the 7.875% Notes. We had been amortizing the debt issuance costs for the 7.875% Notes over the expected life of the borrowing.
	5.125% Notes In the fourth quarter of 2013, we issued $200.0 million of 5.125% senior unsecured notes due 2019 (5.125% Notes). Net proceeds from the 5.125% Notes were used to redeem the remaining $190.0 million outstanding under our 9.25% senior secured notes due 2017. We paid remaining debt issuance costs of $0.2 million in the first nine months of 2014 related to the 5.125% Notes.
	We utilize local currency credit facilities to finance the operations of certain foreign subsidiaries.  At September 30, 2014, $43.2 million was outstanding under these facilities and an additional $49.2 million was available.
	The weighted-average interest rate of our long-term debt outstanding was 6.4% at September 30, 2014 and 6.3% as of December 31, 2013.

Fair_Value

Fair Value	9 Months Ended
	Sep. 30, 2014
Fair Value [Abstract]
Fair Value Disclosures [Text Block]	4. FAIR VALUE
	The fair value accounting guidance defines fair value as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.”  The definition is based on an exit price rather than an entry price, regardless of whether the entity plans to hold or sell the asset.  This guidance also establishes a fair value hierarchy to prioritize inputs used in measuring fair value as follows:
	•	Level 1:  Observable inputs such as quoted prices in active markets;
	•	Level 2:  Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and
	•	Level 3:  Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
	Financial instruments   The estimated fair value of our financial assets and liabilities that are recognized at fair value on a recurring basis, using available market information and other observable data, as of September 30, 2014, are as follows:
			September 30, 2014				December 31, 2013
			Carrying Amount		Fair Value		Carrying Amount		Fair Value		Input
			(in millions)				(in millions)
	Balance Sheet Classification
	Cash equivalents		$	33.7	$	33.7	$	6.1	$	6.1	Level 1
	Prepaid expenses and other current
	assets
	Currency forward contracts		0.3		0.3		0.7		0.7		Level 2
	Other accrued expenses
	Currency forward contracts		1		1		0.4		0.4		Level 2
	Other long-term liabilities
	Currency forward contracts		0.3		0.3		—		—		Level 2
	The carrying values of our cash, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the short-term maturities of these instruments.  The carrying values of our borrowings under the foreign credit facilities approximate their fair value due to the frequent resetting of the interest rates.  We estimated the fair value of the amounts outstanding on our debt using available market information and other observable data, to be as follows:
			September 30, 2014				December 31, 2013
			Carrying  Amount		Fair Value		Carrying  Amount		Fair Value
											Input
			(in millions)				(in millions)
	Revolving Credit Facility		$	—	$	—	$	—	$	—	Level 2
	Term Facility		144.4		142.9		150		147.8		Level 2
	7.75% Notes		200		221		200		227.5		Level 2
	6.625% Notes		550		577.1		550		578.9		Level 2
	6.25% Notes		400		412		400		423		Level 2
	5.125% Notes		200		198.5		200		206		Level 2

Derivatives

Derivatives

9 Months Ended

Sep. 30, 2014

Derivatives [Abstract]

Derivative Instruments and Hedging Activities Disclosure [Text Block]

5. DERIVATIVES

Our business and financial results are affected by fluctuations in world financial markets, including interest rates and currency exchange rates.  Our hedging policy has been developed to manage these risks to an acceptable level based on management’s judgment of the appropriate trade-off between risk, opportunity and cost.  We do not hold financial instruments for trading or speculative purposes.

Currency forward contracts  From time to time, we use foreign currency forward contracts to reduce the effects of fluctuations in exchange rates, primarily relating to the Mexican Peso, Euro, Swedish Krona, Polish Zloty and Pound Sterling.  As of September 30, 2014, we have currency forward contracts outstanding with a notional amount of $89.7 million that hedge our exposure to changes in foreign currency exchange rates for our payroll expenses, indirect inventory and other working capital items.

The following table summarizes the reclassification of pre-tax derivative gains into net income from accumulated other comprehensive income (loss):

Location of

Gain Reclassified

Loss Expected to be

Gain

Three Months Ended

Nine Months Ended

Reclassified

Reclassified into

September 30,

September 30,

During the

Net Income

2014

2013

2014

2013

Next 12 Months

(in millions)

Currency forward contracts

Cost of Goods Sold

$

0.5

$

0.5

$

0.7

$

2.6

$

(0.5

)

Employee_Benefit_Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2014
Employee Benefit Plans [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	6. EMPLOYEE BENEFIT PLANS
	The components of net periodic benefit cost (credit) are as follows:
		Pension Benefits
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(in millions)
	Service cost	$	0.9		$	0.8		$	2.7		$	2.6
	Interest cost	9			8.5			27			25.5
	Expected asset return	(12.1		)	(11.5		)	(36.3		)	(34.5		)
	Amortized loss	1.3			2.2			3.9			7
	Amortized prior service cost	—			4.8			—			5.4
	Net periodic benefit cost (credit)	$	(0.9	)	$	4.8		$	(2.7	)	$	6
		Other Postretirement Benefits
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(in millions)
	Service cost	$	0.1		$	0.1		$	0.3		$	0.3
	Interest cost	3.8			3.3			11.4			9.9
	Amortized loss	0.2			0.2			0.6			0.6
	Amortized prior service credit	(0.7		)	(0.4		)	(2.1		)	(1.3		)
	Net periodic benefit cost	$	3.4		$	3.2		$	10.2		$	9.5
	Due to the availability of our prefunding balances (previous contributions in excess of prior required pension contributions), we are not required to make any cash payments in 2014. We expect our cash payments for other postretirement benefit obligations in 2014, net of GM cost sharing, to be approximately $17 million.
	In the third quarter of 2013, we remeasured our AAM Supplemental Executive Retirement Plan (SERP) due to the passing of our Co-Founder and Executive Chairman of the Board of Directors. As a result of this remeasurement, we recorded $4.7 million in selling, general & administrative expense related to the acceleration of prior service cost.

Product_Warranties

Product Warranties	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies [Abstract]
Product Warranty Disclosure [Text Block]
	7	PRODUCT WARRANTIES
	We record a liability for estimated warranty obligations at the dates our products are sold. These estimates are established using sales volumes and internal and external warranty data where there is no payment history and historical information about the average cost of warranty claims for customers with prior claims. We estimate our costs based on the contractual arrangements with our customers, existing customer warranty terms and internal and external warranty data, which includes a determination of our warranty claims and take actions to improve product quality and minimize warranty claims. We continuously evaluate these estimates and our customers' administration of their warranty programs. We closely monitor actual warranty claim data and adjust the liability, as necessary, on a quarterly basis.
	The following table provides a reconciliation of changes in the product warranty liability:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
			(in millions)
	Beginning balance		$	18.2		$	23.2		$	14.3		$	29.1
	Accruals		0.9			3.2			7.3			8.9
	Settlements		(0.2		)	(0.1		)	(1.2		)	(10.6		)
	Adjustment to prior period accruals, net		(2.2		)	(6.9		)	(3.8		)	(7.8		)
	Foreign currency translation		(0.2		)	—			(0.1		)	(0.2		)
	Ending balance		$	16.5		$	19.4		$	16.5		$	19.4

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Taxes [Abstract]
Income Tax Disclosure [Text Block]	8. INCOME TAXES
	We are required to adjust our effective tax rate each quarter to estimate our annual effective tax rate. We must also record the tax impact of certain discrete, unusual or infrequently occurring items, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, in the interim period in which they occur. In addition, jurisdictions with a projected loss for the year or a year-to-date loss where no tax benefit can be recognized are excluded from the estimated annual effective tax rate. The impact of such an exclusion could result in a higher or lower effective tax rate during a particular quarter, based upon the mix and timing of actual earnings versus annual projections.
	Income tax expense was $7.5 million in the three months ended September 30, 2014 as compared to $6.1 million in the three months ended September 30, 2013.  Our effective income tax rate was 14.6% in the third quarter of 2014 as compared to 16.1% in the third quarter of 2013.
	Income tax expense was $25.8 million in the first nine months of 2014 as compared to $9.1 million in the first nine months of 2013.  Our effective income tax rate was 16.6% in the first nine months of 2014 as compared to 12.3% in the first nine months of 2013.
	Our income tax expense and effective tax rate for the three and nine months ended September 30, 2014 and September 30, 2013 primarily reflect favorable foreign tax rates, along with our inability to realize a tax benefit for current foreign losses. For the three months ended September 30, 2013, we recorded tax expense of $2.2 million relating to certain changes in estimates in a foreign jurisdiction. Additionally, in the first quarter of 2013, we recorded a tax benefit of $1.5 million relating to the release of a prior year unrecognized tax benefit due to the expiration of the applicable statute of limitations and a tax benefit of $3.3 million relating to an election we made in the first nine months of 2013 regarding the treatment of foreign exchange gains and losses in a foreign jurisdiction.
	In the nine months ended September 30, 2013, we settled a transfer pricing examination of our 2006 income tax return with the Mexican tax authorities. This settlement resulted in a reduction of our liability for unrecognized income tax benefits and a cash payment of $4.7 million.
	Based on the status of audits outside the U.S., and the protocol of finalizing audits by the relevant tax authorities, it is not possible to estimate the impact of changes, if any, to previously recorded uncertain tax positions. Although it is not possible to predict the timing of the conclusion of all ongoing audits with certainty, we anticipate that the current 2007 and 2008 audits with the Mexican tax authorities will be completed before 2016. It is possible that a change in the unrecognized tax benefits may occur as a result of the completion of this audit; however, quantification of an estimated range cannot be made at this time.

Earnings_Per_Share_EPS

Earnings Per Share (EPS)	9 Months Ended
	Sep. 30, 2014
Earnings (Loss) per Share (EPS) [Abstract]
Earnings Per Share [Text Block]	9. EARNINGS PER SHARE (EPS)
	The following table sets forth the computation of our basic and diluted EPS:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(in millions, except per share data)
	Numerator
	Net income	$	44	$	31.6	$	129.8	$	64.7
	Denominator
	Basic shares outstanding -
	Weighted-average shares outstanding	77.4		76.9		77.2		76.6
	Effect of dilutive securities
	Dilutive stock-based compensation	0.2		0.1		0.2		0.1
	Diluted shares outstanding -
	Adjusted weighted-average shares after assumed conversions	77.6		77		77.4		76.7
	Basic EPS	$	0.57	$	0.41	$	1.68	$	0.84
	Diluted EPS	$	0.57	$	0.41	$	1.68	$	0.84
	Certain exercisable stock options were excluded from the computations of diluted EPS because the exercise price of these options was greater than the average period market prices. The number of stock options outstanding, which were not included in the calculation of diluted EPS, was 0.5 million at September 30, 2014 and 2.0 million at September 30, 2013. The range of exercise prices related to the excluded exercisable stock options was $19.54 - $26.65 at September 30, 2014 and $19.54 - $40.83 at September 30, 2013.

Reclassifications_out_of_Accum

Reclassifications out of Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2014
Disclosure of Reclassification Amount [Text Block]	10. RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	Reclassification adjustments and other activity impacting accumulated other comprehensive income (loss) during the three months ended September 30, 2014 and September 30, 2013 are as follows (in millions):
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Gain on Derivatives				Total
	Balance at June 30, 2014	$	(192.2	)		$	(7.2	)	$	1.7			$	(197.7	)
	Other comprehensive loss before reclassifications	—			(a)	(23.3		)	(2.0		)		(25.3		)
	Amounts reclassified from accumulated other comprehensive income (loss)	0.6			(a)(b)	—			(0.5		)	(c)	0.1
	Net current period other comprehensive income (loss)	0.6				(23.3		)	(2.5		)		(25.2		)
	Balance at September 30, 2014	$	(191.6	)		$	(30.5	)	$	(0.8	)		$	(222.9	)
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Gain on Derivatives				Total
	Balance at June 30, 2013	$	(273.9	)		$	(9.2	)	$	0.7			$	(282.4	)
	Other comprehensive income (loss) before reclassifications	10.7			(a)	2.5			(0.1		)		13.1
	Amounts reclassified from accumulated other comprehensive income (loss)	4.4			(a)(b)	—			(0.5		)	(c)	3.9
	Net current period other comprehensive income (loss)	15.1				2.5			(0.6		)		17
	Balance at September 30, 2013	$	(258.8	)		$	(6.7	)	$	0.1			$	(265.4	)
	(a)	The amounts are net of tax of $0.0 million and $(0.3) million for the other comprehensive loss before reclassifications and the amounts reclassified from AOCI, respectively, for the three months ended September 30, 2014, and $(5.6) million and $(2.3) million, respectively, for the three months ended September 30, 2013.
	(b)	The net amount reclassified from AOCI included $0.8 million in cost of goods sold (COGS) and $(0.3) million in selling, general & administrative expenses (SG&A) for the three months ended September 30, 2014 and $1.2 million in COGS and $3.2 million in SG&A for the three months ended September 30, 2013.
	(c)	The amounts reclassified from AOCI are included in COGS.
	Reclassification adjustments and other activity impacting accumulated other comprehensive income (loss) during the nine months ended September 30, 2014 and September 30, 2013 are as follows (in millions):
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Gain on Derivatives				Total
	Balance at December 31, 2013	$	(197.9	)		$	(18.6	)	$	0.3			$	(216.2	)
	Other comprehensive income (loss) before reclassifications	4.5			(a)	(11.9		)	(0.4		)		(7.8		)
	Amounts reclassified from accumulated other comprehensive income (loss)	1.8			(a)(b)	—			(0.7		)	(c)	1.1
	Net current period other comprehensive income (loss)	6.3				(11.9		)	(1.1		)		(6.7		)
	Balance at September 30, 2014	$	(191.6	)		$	(30.5	)	$	(0.8	)		$	(222.9	)
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Gain on Derivatives				Total
	Balance at December 31, 2012	$	(274.5	)		$	7.6		$	2.3			$	(264.6	)
	Other comprehensive income (loss) before reclassifications	8			(a)	(14.3		)	0.4				(5.9		)
	Amounts reclassified from accumulated other comprehensive income (loss)	7.7			(a)(b)	—			(2.6		)	(c)	5.1
	Net current period other comprehensive income (loss)	15.7				(14.3		)	(2.2		)		(0.8		)
	Balance at September 30, 2013	$	(258.8	)		$	(6.7	)	$	0.1			$	(265.4	)
	(a)	The amounts are net of tax of $(2.4) million and $(0.8) million for other comprehensive income before reclassifications and the amounts reclassified from AOCI, respectively, for the nine months ended September 30, 2014, and $(4.0) million each for both line items, for the nine months ended September 30, 2013.
	(b)	The net amount reclassified from AOCI included $2.5 million in COGS and $(0.8) million in SG&A for the nine months ended September 30, 2014 and $3.5 million in COGS and $4.2 million in SG&A for the nine months ended September 30, 2013.
	(c)	The amounts reclassified from AOCI are included in COGS.

Supplemental_Guarantor_Condens

Supplemental Guarantor Condensed Consolidating Financial Statements	9 Months Ended
	Sep. 30, 2014
Supplemental Guarantor Condensed Consolidating Financial Statements [Abstract]
Supplemental Guarantor Disclosure [Text Block]	11. SUPPLEMENTAL GUARANTOR CONDENSED CONSOLIDATING FINANCIAL STATEMENTS
	Amounts have been revised for the effects of the error as discussed in Note 1 - Organization and Basis of Presentation.
	Holdings has no significant assets other than its 100% ownership in AAM, Inc. and no direct subsidiaries other than AAM, Inc. The 7.75% Notes, 6.625% Notes, 6.25% Notes and 5.125% Notes are senior unsecured obligations of AAM Inc.; all of which are fully and unconditionally guaranteed by Holdings and substantially all domestic subsidiaries of AAM, Inc, which are 100% indirectly owned by Holdings.
	These Condensed Consolidating Financial Statements are prepared under the equity method of accounting whereby the investments in subsidiaries are recorded at cost and adjusted for the parent’s share of the subsidiaries’ cumulative results of operations, capital contributions and distributions, and other equity changes.
	Condensed Consolidating Statements of Income
	Three Months Ended September 30,
	(in millions)
			Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2014		(a)			(b)						(c)
	Net sales
	External		$	—		$	300.9		$	56.9		$	593		$	—		$	950.8
	Intercompany		—			2.7			64.1			5.3			(72.1		)	—
	Total net sales		—			303.6			121			598.3			(72.1		)	950.8
	Cost of goods sold		—			291.9			100.5			489.8			(72.1		)	810.1
	Gross profit		—			11.7			20.5			108.5			—			140.7
	Selling, general and administrative expenses		—			55			—			9			—			64
	Operating income (loss)		—			(43.3		)	20.5			99.5			—			76.7
	Non-operating income (expense), net		—			(25.8		)	2			(1.4		)	—			(25.2		)
	Income (loss) before income taxes		—			(69.1		)	22.5			98.1			—			51.5
	Income tax expense		—			6.6			0.1			0.8			—			7.5
	Earnings (loss) from equity in subsidiaries		44			63.9			(9.1		)	—			(98.8		)	—
	Net income (loss) before royalties and dividends		44			(11.8		)	13.3			97.3			(98.8		)	44
	Royalties and dividends		—			55.8			—			(55.8		)	—			—
	Net income after royalties and dividends		44			44			13.3			41.5			(98.8		)	44
	Other comprehensive loss		(25.2		)	(25.2		)	(19.0		)	(22.2		)	66.4			(25.2		)
	Comprehensive income (loss)		$	18.8		$	18.8		$	(5.7	)	$	19.3		$	(32.4	)	$	18.8
	(a)	Earnings (loss) from equity in subsidiaries as previously reported was $48.6 million and was adjusted by $4.6 million due to the error as disclosed in Note 1.
	(b)	Earnings (loss) from equity in subsidiaries as previously reported was $68.5 million and was adjusted by $4.6 million due to the error as disclosed in Note 1.
	(c)	Cost of goods sold as previously reported was $481.4 million and increased by $8.4 million due to the error disclosed in Note 1. Income tax expense as previously reported was $4.6 million and decreased by $3.8 million due to the error disclosed in Note 1.
			Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2013
	Net sales
	External		$	—		$	162.6		$	57.8		$	600.4		$	—		$	820.8
	Intercompany		—			5			55.2			1.7			(61.9		)	—
	Total net sales		—			167.6			113			602.1			(61.9		)	820.8
	Cost of goods sold		—			170.1			97.2			490.1			(61.9		)	695.5
	Gross profit (loss)		—			(2.5		)	15.8			112			—			125.3
	Selling, general and administrative expenses		—			48.1			—			9.7			—			57.8
	Operating income (loss)		—			(50.6		)	15.8			102.3			—			67.5
	Non-operating income (expense), net		—			(30.6		)	2.5			(1.7		)	—			(29.8		)
	Income (loss) before income taxes		—			(81.2		)	18.3			100.6			—			37.7
	Income tax expense		—			0.9			—			5.2			—			6.1
	Earnings (loss) from equity in subsidiaries		31.6			50.7			(1.5		)	—			(80.8		)	—
	Net income (loss) before royalties and dividends		31.6			(31.4		)	16.8			95.4			(80.8		)	31.6
	Royalties and dividends		—			63			—			(63.0		)	—			—
	Net income after royalties and dividends		31.6			31.6			16.8			32.4			(80.8		)	31.6
	Other comprehensive income (loss)		17			17			(0.8		)	(1.7		)	(14.5		)	17
	Comprehensive income		$	48.6		$	48.6		$	16		$	30.7		$	(95.3	)	$	48.6
	Condensed Consolidating Statements of Income
	Nine Months Ended September 30,
	(in millions)
			Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2014		(a)			(b)						(c)
	Net sales
	External		$	—		$	826.8		$	174		$	1,755.70		$	—		$	2,756.50
	Intercompany		—			8.5			184.7			17.3			(210.5		)	—
	Total net sales		—			835.3			358.7			1,773.00			(210.5		)	2,756.50
	Cost of goods sold		—			812.3			303			1,440.10			(210.5		)	2,344.90
	Gross profit		—			23			55.7			332.9			—			411.6
	Selling, general and administrative expenses		—			155.6			0.1			26.9			—			182.6
	Operating income (loss)		—			(132.6		)	55.6			306			—			229
	Non-operating income (expense), net		—			(77.5		)	7.2			(3.1		)	—			(73.4		)
	Income (loss) before income taxes		—			(210.1		)	62.8			302.9			—			155.6
	Income tax expense		—			13.4			0.3			12.1			—			25.8
Earnings (loss) from equity in subsidiaries		129.8			186.7			(25.1		)	—			(291.4		)	—
Net income (loss) before royalties and dividends		129.8			(36.8		)	37.4			290.8			(291.4		)	129.8
Royalties and dividends		—			166.6			—			(166.6		)	—			—
Net income after royalties and dividends		129.8			129.8			37.4			124.2			(291.4		)	129.8
Other comprehensive income (loss)		(6.7		)	(6.7		)	(7.9		)	(10.7		)	25.3			(6.7		)
Comprehensive income		$	123.1		$	123.1		$	29.5		$	113.5		$	(266.1	)	$	123.1
(a)	Earnings (loss) from equity in subsidiaries as previously reported was $134.4 million and was adjusted by $4.6 million due to the error as disclosed in Note 1.
(b)	Earnings (loss) from equity in subsidiaries as previously reported was $191.3 million and was adjusted by $4.6 million due to the error as disclosed in Note 1.
(c)	Cost of goods sold as previously reported was $1,431.7 million and increased by $8.4 million due to the error disclosed in Note 1. Income tax expense as previously reported was $15.9 million and decreased by $3.8 million due to the error disclosed in Note 1.
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
2013
Net sales
External		$	—		$	574.2		$	170.5		$	1,631.30		$	—		$	2,376.00
Intercompany		—			13			169.1			9			(191.1		)	—
Total net sales		—			587.2			339.6			1,640.30			(191.1		)	2,376.00
Cost of goods sold		—			566.3			293.3			1,355.70			(191.1		)	2,024.20
Gross profit		—			20.9			46.3			284.6			—			351.8
Selling, general and administrative expenses		—			149.3			—			28.6			—			177.9
Operating income (loss)		—			(128.4		)	46.3			256			—			173.9
Non-operating income (expense), net		—			(101.4		)	7.9			(6.6		)	—			(100.1		)
Income (loss) before income taxes		—			(229.8		)	54.2			249.4			—			73.8
Income tax expense (benefit)		—			(13.0		)	—			22.1			—			9.1
Earnings (loss) from equity in subsidiaries		64.7			115.6			(14.4		)	—			(165.9		)	—
Net income (loss) before royalties and dividends		64.7			(101.2		)	39.8			227.3			(165.9		)	64.7
Royalties and dividends		—			165.9			—			(165.9		)	—			—
Net income after royalties and dividends		64.7			64.7			39.8			61.4			(165.9		)	64.7
Other comprehensive loss		(0.8		)	(0.8		)	(14.4		)	(17.8		)	33			(0.8		)
Comprehensive income		$	63.9		$	63.9		$	25.4		$	43.6		$	(132.9	)	$	63.9
Condensed Consolidating Balance Sheets
(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
September 30, 2014		(a)			(b)						(c)
Assets
Current assets
Cash and cash equivalents		$	—		$	39.2		$	—		$	179.8		$	—		$	219
Accounts receivable, net		—			164.3			28.6			407.3			—			600.2
Intercompany receivables		—			170.9			164			10.1			(345.0		)	—
Inventories, net		—			62.3			32.1			154.8			—			249.2
Other current assets		—			39.9			3			67.9			—			110.8
Total current assets		—			476.6			227.7			819.9			(345.0		)	1,179.20
Property, plant and equipment, net		—			227			86.5			753.2			—			1,066.70
Goodwill		—			—			147.9			7.7			—			155.6
Intercompany notes and accounts receivable		—			327.3			216.8			—			(544.1		)	—
Other assets and deferred charges		—			665			45.8			115.6			—			826.4
Investment in subsidiaries		495			1,401.40			—			—			(1,896.4		)	—
Total assets		$	495		$	3,097.30		$	724.7		$	1,696.40		$	(2,785.5	)	$	3,227.90
Liabilities and stockholders’ equity
Current liabilities
Current portion of long-term debt		$	—		$	8.4		$	—		$	8.7		$	—		$	17.1
Accounts payable		—			156			47.3			293			—			496.3
Intercompany payables		—			153.7			125.2			62.2			(341.1		)	—
Other current liabilities		—			117.4			5.4			102.3			—			225.1
Total current liabilities		—			435.5			177.9			466.2			(341.1		)	738.5
Intercompany notes and accounts payable		323.4			3.9			—			220.7			(548.0		)	—
Long-term debt		—			1,485.90			5			34.6			—			1,525.50
Investment in subsidiaries obligation		—			—			34.4			—			(34.4		)	—
Other long-term liabilities		—			677			0.6			114.7			—			792.3
Total liabilities		323.4			2,602.30			217.9			836.2			(923.5		)	3,056.30
Total stockholders’ equity		171.6			495			506.8			860.2			(1,862.0		)	171.6
Total liabilities and stockholders’ equity		$	495		$	3,097.30		$	724.7		$	1,696.40		$	(2,785.5	)	$	3,227.90
(a)	Investments in subsidiaries as previously reported was $492.7 million and was adjusted by $2.3 million due to the error as disclosed in Note 1.
(b)	Investments in subsidiaries as previously reported was $1,399.1 million and was adjusted by $2.3 million due to the error as disclosed in Note 1.
(c)	Other current assets as previously reported was $65.6 million and increased by $2.3 million due to the error as disclosed in Note 1.
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
December 31, 2013
Assets
Current assets
Cash and cash equivalents		$	—		$	36.9		$	—		$	117.1		$	—		$	154
Accounts receivable, net		—			102.7			25.6			330.2			—			458.5
Intercompany receivables		—			180.5			116.6			9.2			(306.3		)	—
Inventories, net		—			62.4			34.2			165.2			—			261.8
Other current assets		—			43.8			3.2			75			—			122
Total current assets		—			426.3			179.6			696.7			(306.3		)	996.3
Property, plant and equipment, net		—			239.8			83			735.7			—			1,058.50
Goodwill		—			—			147.8			8.6			—			156.4
Intercompany notes and accounts receivable		—			327			201.5			—			(528.5		)	—
Other assets and deferred charges		—			671.7			44.8			99.8			—			816.3
Investment in subsidiaries		363.7			1,240.10			—			—			(1,603.8		)	—
Total assets		$	363.7		$	2,904.90		$	656.7		$	1,540.80		$	(2,438.6	)	$	3,027.50
Liabilities and stockholders’ equity
Current liabilities
Accounts payable		$	—		$	106.2		$	44.5		$	286.7		$	—		$	437.4
Intercompany payables		—			117.4			98.6			90.3			(306.3		)	—
Other current liabilities		—			120.4			4.1			96.8			—			221.3
Total current liabilities		—			344			147.2			473.8			(306.3		)	658.7
Intercompany notes and accounts payable		323.2			3.7			—			201.6			(528.5		)	—
Long-term debt		—			1,500.00			5.3			53.8			—			1,559.10
Investment in subsidiaries obligation		—			—			15.2			—			(15.2		)	—
Other long-term liabilities		—			693.5			0.5			75.2			—			769.2
Total liabilities		323.2			2,541.20			168.2			804.4			(850.0		)	2,987.00
Total stockholders’ equity		40.5			363.7			488.5			736.4			(1,588.6		)	40.5
Total liabilities and stockholders’ equity		$	363.7		$	2,904.90		$	656.7		$	1,540.80		$	(2,438.6	)	$	3,027.50
Condensed Consolidating Statements of Cash Flows
Nine Months Ended September 30,
(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
2014
Net cash provided by (used in) operating activities		$	(0.1	)	$	32.6		$	33.1		$	166		$	—		$	231.6
Investing activities
Purchases of property, plant and equipment		—			(32.7		)	(13.7		)	(109.8		)	—			(156.2		)
Proceeds from sale of property, plant and equipment		—			7.8			0.2			0.5			—			8.5
Intercompany activity		—			—			(19.3		)	—			19.3			—
Net cash used in investing activities		—			(24.9		)	(32.8		)	(109.3		)	19.3			(147.7		)
Financing activities
Net debt activity		—			(5.9		)	(0.3		)	(10.5		)	—			(16.7		)
Debt issuance costs		—			(0.3		)	—			—			—			(0.3		)
Employee stock option exercises		—			1.2			—			—			—			1.2
Purchase of treasury stock		(0.3		)	—			—			—			—			(0.3		)
Intercompany activity		0.4			(0.4		)	—			19.3			(19.3		)	—
Net cash provided by (used in) financing activities		0.1			(5.4		)	(0.3		)	8.8			(19.3		)	(16.1		)
Effect of exchange rate changes on cash		—			—			—			(2.8		)	—			(2.8		)
Net increase in cash and cash equivalents		—			2.3			—			62.7			—			65
Cash and cash equivalents at beginning of period		—			36.9			—			117.1			—			154
Cash and cash equivalents at end of period		$	—		$	39.2		$	—		$	179.8		$	—		$	219
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
2013
Net cash provided by (used in) operating activities		$	0.6		$	(55.4	)	$	46.8		$	110.3		$	—		$	102.3
Investing activities
Purchases of property, plant and equipment		—			(43.6		)	(7.0		)	(127.6		)	—			(178.2		)
Proceeds from sale of property, plant and equipment		—			4.9			0.5			0.4			—			5.8
Proceeds from sale-leaseback of equipment		—			23.5			—			—			—			23.5
Intercompany activity								(40.1		)				40.1			—
Net cash used in investing activities		—			(15.2		)	(46.6		)	(127.2		)	40.1			(148.9		)
Financing activities
Net debt activity		—			97			(0.2		)	19			—			115.8
Debt issuance costs		—			(12.9		)	—			—			—			(12.9		)
Employee stock option exercises		—			0.8			—			—			—			0.8
Purchase of treasury stock		(0.4		)	—			—			—			—			(0.4		)
Intercompany activity		(0.2		)	0.2			—			40.1			(40.1		)	—
Net cash provided by (used in) financing activities		(0.6		)	85.1			(0.2		)	59.1			(40.1		)	103.3
Effect of exchange rate changes on cash		—			—			—			(0.5		)	—			(0.5		)
Net increase in cash and cash equivalents		—			14.5			—			41.7			—			56.2
Cash and cash equivalents at beginning of period		—			10.6			—			51.8			—			62.4
Cash and cash equivalents at end of period		$	—		$	25.1		$	—		$	93.5		$	—		$	118.6

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation Revision of Prior Period Financial Statements (Policies)	9 Months Ended
	Sep. 30, 2014
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]	Restatement of Prior Period Financial Statements In connection with the preparation of our consolidated financial statements for the year ended December 31, 2014, we determined that entries recorded in the third quarter of 2014 to reduce certain accrued accounts payable balances by $8.4 million were originally recorded as a reduction of cost of goods sold but should have been recorded as an adjustment to opening accumulated deficit because the amounts giving rise to the correction originated in periods prior to January 1, 2012. While management determined that it was necessary to restate the September 30, 2014 interim period, the effect of correcting these errors was not material to opening accumulated deficit as of January 1, 2012.
	As shown in the tables below, the effect of the correction of this error was a decrease of $6.9 million in opening accumulated deficit as of January 1, 2012, which resulted from a reduction in accounts payable of $8.4 million and a decrease in deferred tax assets of $1.5 million. The impact of the correction of this error for the three and nine months ended September 30, 2014 was an increase in cost of goods sold of $8.4 million, a decrease in income tax expense of $3.8 million and a decrease in net income of $4.6 million.
	The following tables present the effects of the restatement on the previously issued financial statements presented herein.
		Three Months Ended									Nine Months Ended
		30-Sep-14									30-Sep-14
		(in millions, except per share data)
		As previously reported			Adjustment			As restated			As previously reported		Adjustment			As restated
	Condensed Consolidated Statements of Income (Unaudited)
	Cost of goods sold	$	801.7		$	8.4		$	810.1		$	2,336.50	$	8.4		$	2,344.90
	Gross profit	149.1			(8.4		)	140.7			420		(8.4		)	411.6
	Operating income	85.1			(8.4		)	76.7			237.4		(8.4		)	229
	Income before income taxes	59.9			(8.4		)	51.5			164		(8.4		)	155.6
	Income tax expense	11.3			(3.8		)	7.5			29.6		(3.8		)	25.8
	Net income	48.6			(4.6		)	44			134.4		(4.6		)	129.8
	Basic earnings per share	$	0.63		$	(0.06	)	$	0.57		$	1.74	$	(0.06	)	$	1.68
	Diluted earnings per share	$	0.63		$	(0.06	)	$	0.57		$	1.74	$	(0.06	)	$	1.68
	Condensed Consolidated Statements of Comprehensive Income (Unaudited)
	Net income	$	48.6		$	(4.6	)	$	44		$	134.4	$	(4.6	)	$	129.8
	Comprehensive income	23.4			(4.6		)	18.8			127.7		(4.6		)	123.1
	Condensed Consolidated Statements of Cash Flows (Unaudited)
	Net income										$	134.4	$	(4.6	)	$	129.8
	Deferred income taxes										10.5		(3.8		)	6.7
	Accounts payable and accrued expenses										60		8.4			68.4
		30-Sep-14
		As previously reported			Adjustment			As restated
		(in millions)
	Condensed Consolidated Balance Sheet (Unaudited)
	Prepaid expenses and other current assets	$	108.5		$	2.3		$	110.8
	Total current assets	1,176.90			2.3			1,179.20
	Total assets	3,225.60			2.3			3,227.90
	Accumulated deficit	(46.9		)	2.3			(44.6		)
	Total stockholders' equity	169.3			2.3			171.6
	Total liabilities and stockholders' equity	3,225.60			2.3			3,227.90
		31-Dec-13
		As previously reported			Adjustment			As restated
		(in millions)
	Condensed Consolidated Balance Sheet
	Prepaid expenses and other current assets	$	123.5		$	(1.5	)	$	122
	Total current assets	997.8			(1.5		)	996.3
	Total assets	3,029.00			(1.5		)	3,027.50
	Accounts payable	445.8			(8.4		)	437.4
	Total current liabilities	667.1			(8.4		)	658.7
	Total liabilities	2,995.40			(8.4		)	2,987.00
	Accumulated deficit	(181.3		)	6.9			(174.4		)
	Total stockholders' equity	33.6			6.9			40.5

Organization_and_Basis_of_Pres2

Organization and Basis of Presentation Effect of New Accounting Standards (Policies)	9 Months Ended
	Sep. 30, 2014
New Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Effect of New Accounting Standards On January 1, 2014, new accounting guidance became effective regarding financial statement presentation of an unrecognized tax benefit when a net operating loss (NOL) carryforward, a similar tax loss, or a tax credit carryforward exists. The new guidance requires entities to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for an NOL carryforward, a similar tax loss, or a tax credit carryforward, except when one is not available as of the reporting date or the entity does not intend to use the deferred tax asset for this purpose. This guidance does not affect the tabular reconciliation of the total amounts of unrecognized tax benefits, as the tabular reconciliation presents the gross amount of unrecognized tax benefits. The adoption of this new guidance has had no impact on our condensed consolidated financial statements.
	In May 2014, new accounting guidance was issued that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The guidance is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.  The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract.  Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard.  This guidance becomes effective for AAM at the beginning of our 2017 fiscal year and early adoption is not permitted.  We are currently assessing the impact that this standard will have on our consolidated financial statements.

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2014
Inventories [Abstract]
Schedule of Inventory, Current [Table Text Block]	Inventories consist of the following:
		September 30, 2014			December 31, 2013
		(in millions)
	Raw materials and work-in-progress	$	252.4		$	263.4
	Finished goods	29.1			25.7
	Gross inventories	281.5			289.1
	Inventory valuation reserves	(32.3		)	(27.3		)
	Inventories, net	$	249.2		$	261.8

LongTerm_Debt_Tables

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2014
Long Term Debt and Lease Obligations [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt consists of the following:
		September 30, 2014		December 31, 2013
		(in millions)
	Revolving Credit Facility	$	—	$	—
	Term Facility	144.4		150
	7.75% Notes	200		200
	6.625% Notes	550		550
	6.25% Notes	400		400
	5.125% Notes	200		200
	Foreign credit facilities	43.2		53.8
	Capital lease obligations	5		5.3
	Debt	1,542.60		1,559.10
	Less: Current portion of long-term debt	17.1		—
	Long-term debt	$	1,525.50	$	1,559.10

Fair_Value_Tables

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The estimated fair value of our financial assets and liabilities that are recognized at fair value on a recurring basis, using available market information and other observable data, as of September 30, 2014, are as follows:
		September 30, 2014				December 31, 2013
		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Input
		(in millions)				(in millions)
	Balance Sheet Classification
	Cash equivalents	$	33.7	$	33.7	$	6.1	$	6.1	Level 1
	Prepaid expenses and other current
	assets
	Currency forward contracts	0.3		0.3		0.7		0.7		Level 2
	Other accrued expenses
	Currency forward contracts	1		1		0.4		0.4		Level 2
	Other long-term liabilities
	Currency forward contracts	0.3		0.3		—		—		Level 2
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]	We estimated the fair value of the amounts outstanding on our debt using available market information and other observable data, to be as follows:
		September 30, 2014				December 31, 2013
		Carrying  Amount		Fair Value		Carrying  Amount		Fair Value
										Input
		(in millions)				(in millions)
	Revolving Credit Facility	$	—	$	—	$	—	$	—	Level 2
	Term Facility	144.4		142.9		150		147.8		Level 2
	7.75% Notes	200		221		200		227.5		Level 2
	6.625% Notes	550		577.1		550		578.9		Level 2
	6.25% Notes	400		412		400		423		Level 2
	5.125% Notes	200		198.5		200		206		Level 2

Derivatives_Tables

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2014
Derivatives and Risk Management [Abstract]
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	The following table summarizes the reclassification of pre-tax derivative gains into net income from accumulated other comprehensive income (loss):
		Location of	Gain Reclassified								Loss Expected to be
		Gain	Three Months Ended				Nine Months Ended				Reclassified
		Reclassified into	September 30,				September 30,				During the
		Net Income	2014		2013		2014		2013		Next 12 Months
			(in millions)
	Currency forward contracts	Cost of Goods Sold	$	0.5	$	0.5	$	0.7	$	2.6	$	(0.5	)

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2014
Employee Benefit Plans [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	The components of net periodic benefit cost (credit) are as follows:
		Pension Benefits
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(in millions)
	Service cost	$	0.9		$	0.8		$	2.7		$	2.6
	Interest cost	9			8.5			27			25.5
	Expected asset return	(12.1		)	(11.5		)	(36.3		)	(34.5		)
	Amortized loss	1.3			2.2			3.9			7
	Amortized prior service cost	—			4.8			—			5.4
	Net periodic benefit cost (credit)	$	(0.9	)	$	4.8		$	(2.7	)	$	6
		Other Postretirement Benefits
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(in millions)
	Service cost	$	0.1		$	0.1		$	0.3		$	0.3
	Interest cost	3.8			3.3			11.4			9.9
	Amortized loss	0.2			0.2			0.6			0.6
	Amortized prior service credit	(0.7		)	(0.4		)	(2.1		)	(1.3		)
	Net periodic benefit cost	$	3.4		$	3.2		$	10.2		$	9.5

Product_Warranties_Tables

Product Warranties (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies [Abstract]
Schedule of Product Warranty Liability [Table Text Block]	The following table provides a reconciliation of changes in the product warranty liability:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(in millions)
	Beginning balance	$	18.2		$	23.2		$	14.3		$	29.1
	Accruals	0.9			3.2			7.3			8.9
	Settlements	(0.2		)	(0.1		)	(1.2		)	(10.6		)
	Adjustment to prior period accruals, net	(2.2		)	(6.9		)	(3.8		)	(7.8		)
	Foreign currency translation	(0.2		)	—			(0.1		)	(0.2		)
	Ending balance	$	16.5		$	19.4		$	16.5		$	19.4

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings (Loss) per Share (EPS) [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of our basic and diluted EPS:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(in millions, except per share data)
	Numerator
	Net income	$	44	$	31.6	$	129.8	$	64.7
	Denominator
	Basic shares outstanding -
	Weighted-average shares outstanding	77.4		76.9		77.2		76.6
	Effect of dilutive securities
	Dilutive stock-based compensation	0.2		0.1		0.2		0.1
	Diluted shares outstanding -
	Adjusted weighted-average shares after assumed conversions	77.6		77		77.4		76.7
	Basic EPS	$	0.57	$	0.41	$	1.68	$	0.84
	Diluted EPS	$	0.57	$	0.41	$	1.68	$	0.84

Reclassifications_out_of_Accum1

Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2014
Reclassification Amount from Accumulated Other Comprehensive Income (Loss) [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Reclassification adjustments and other activity impacting accumulated other comprehensive income (loss) during the three months ended September 30, 2014 and September 30, 2013 are as follows (in millions):
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Gain on Derivatives				Total
	Balance at June 30, 2014	$	(192.2	)		$	(7.2	)	$	1.7			$	(197.7	)
	Other comprehensive loss before reclassifications	—			(a)	(23.3		)	(2.0		)		(25.3		)
	Amounts reclassified from accumulated other comprehensive income (loss)	0.6			(a)(b)	—			(0.5		)	(c)	0.1
	Net current period other comprehensive income (loss)	0.6				(23.3		)	(2.5		)		(25.2		)
	Balance at September 30, 2014	$	(191.6	)		$	(30.5	)	$	(0.8	)		$	(222.9	)
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Gain on Derivatives				Total
	Balance at June 30, 2013	$	(273.9	)		$	(9.2	)	$	0.7			$	(282.4	)
	Other comprehensive income (loss) before reclassifications	10.7			(a)	2.5			(0.1		)		13.1
	Amounts reclassified from accumulated other comprehensive income (loss)	4.4			(a)(b)	—			(0.5		)	(c)	3.9
	Net current period other comprehensive income (loss)	15.1				2.5			(0.6		)		17
	Balance at September 30, 2013	$	(258.8	)		$	(6.7	)	$	0.1			$	(265.4	)
	(a)	The amounts are net of tax of $0.0 million and $(0.3) million for the other comprehensive loss before reclassifications and the amounts reclassified from AOCI, respectively, for the three months ended September 30, 2014, and $(5.6) million and $(2.3) million, respectively, for the three months ended September 30, 2013.
	(b)	The net amount reclassified from AOCI included $0.8 million in cost of goods sold (COGS) and $(0.3) million in selling, general & administrative expenses (SG&A) for the three months ended September 30, 2014 and $1.2 million in COGS and $3.2 million in SG&A for the three months ended September 30, 2013.
	(c)	The amounts reclassified from AOCI are included in COGS.
	Reclassification adjustments and other activity impacting accumulated other comprehensive income (loss) during the nine months ended September 30, 2014 and September 30, 2013 are as follows (in millions):
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Gain on Derivatives				Total
	Balance at December 31, 2013	$	(197.9	)		$	(18.6	)	$	0.3			$	(216.2	)
	Other comprehensive income (loss) before reclassifications	4.5			(a)	(11.9		)	(0.4		)		(7.8		)
	Amounts reclassified from accumulated other comprehensive income (loss)	1.8			(a)(b)	—			(0.7		)	(c)	1.1
	Net current period other comprehensive income (loss)	6.3				(11.9		)	(1.1		)		(6.7		)
	Balance at September 30, 2014	$	(191.6	)		$	(30.5	)	$	(0.8	)		$	(222.9	)
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Gain on Derivatives				Total
	Balance at December 31, 2012	$	(274.5	)		$	7.6		$	2.3			$	(264.6	)
	Other comprehensive income (loss) before reclassifications	8			(a)	(14.3		)	0.4				(5.9		)
	Amounts reclassified from accumulated other comprehensive income (loss)	7.7			(a)(b)	—			(2.6		)	(c)	5.1
	Net current period other comprehensive income (loss)	15.7				(14.3		)	(2.2		)		(0.8		)
	Balance at September 30, 2013	$	(258.8	)		$	(6.7	)	$	0.1			$	(265.4	)

Supplemental_Guarantor_Condens1

Supplemental Guarantor Condensed Consolidating Financial Statements (Tables)	9 Months Ended
	Sep. 30, 2014
Supplemental Guarantor Condensed Consolidating Financial Statements [Abstract]
Supplemental Guarantor Consolidating Income Statement [Table Text Block]
	Condensed Consolidating Statements of Income
	Nine Months Ended September 30,
	(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2014	(a)			(b)						(c)
	Net sales
	External	$	—		$	826.8		$	174		$	1,755.70		$	—		$	2,756.50
	Intercompany	—			8.5			184.7			17.3			(210.5		)	—
	Total net sales	—			835.3			358.7			1,773.00			(210.5		)	2,756.50
	Cost of goods sold	—			812.3			303			1,440.10			(210.5		)	2,344.90
	Gross profit	—			23			55.7			332.9			—			411.6
	Selling, general and administrative expenses	—			155.6			0.1			26.9			—			182.6
	Operating income (loss)	—			(132.6		)	55.6			306			—			229
	Non-operating income (expense), net	—			(77.5		)	7.2			(3.1		)	—			(73.4		)
	Income (loss) before income taxes	—			(210.1		)	62.8			302.9			—			155.6
	Income tax expense	—			13.4			0.3			12.1			—			25.8
	Earnings (loss) from equity in subsidiaries	129.8			186.7			(25.1		)	—			(291.4		)	—
	Net income (loss) before royalties and dividends	129.8			(36.8		)	37.4			290.8			(291.4		)	129.8
	Royalties and dividends	—			166.6			—			(166.6		)	—			—
	Net income after royalties and dividends	129.8			129.8			37.4			124.2			(291.4		)	129.8
	Other comprehensive income (loss)	(6.7		)	(6.7		)	(7.9		)	(10.7		)	25.3			(6.7		)
	Comprehensive income	$	123.1		$	123.1		$	29.5		$	113.5		$	(266.1	)	$	123.1
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2013
	Net sales
	External	$	—		$	162.6		$	57.8		$	600.4		$	—		$	820.8
	Intercompany	—			5			55.2			1.7			(61.9		)	—
	Total net sales	—			167.6			113			602.1			(61.9		)	820.8
	Cost of goods sold	—			170.1			97.2			490.1			(61.9		)	695.5
	Gross profit (loss)	—			(2.5		)	15.8			112			—			125.3
	Selling, general and administrative expenses	—			48.1			—			9.7			—			57.8
	Operating income (loss)	—			(50.6		)	15.8			102.3			—			67.5
	Non-operating income (expense), net	—			(30.6		)	2.5			(1.7		)	—			(29.8		)
	Income (loss) before income taxes	—			(81.2		)	18.3			100.6			—			37.7
	Income tax expense	—			0.9			—			5.2			—			6.1
	Earnings (loss) from equity in subsidiaries	31.6			50.7			(1.5		)	—			(80.8		)	—
	Net income (loss) before royalties and dividends	31.6			(31.4		)	16.8			95.4			(80.8		)	31.6
	Royalties and dividends	—			63			—			(63.0		)	—			—
	Net income after royalties and dividends	31.6			31.6			16.8			32.4			(80.8		)	31.6
	Other comprehensive income (loss)	17			17			(0.8		)	(1.7		)	(14.5		)	17
	Comprehensive income	$	48.6		$	48.6		$	16		$	30.7		$	(95.3	)	$	48.6
	Condensed Consolidating Statements of Income
	Three Months Ended September 30,
	(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2014	(a)			(b)						(c)
	Net sales
	External	$	—		$	300.9		$	56.9		$	593		$	—		$	950.8
	Intercompany	—			2.7			64.1			5.3			(72.1		)	—
	Total net sales	—			303.6			121			598.3			(72.1		)	950.8
	Cost of goods sold	—			291.9			100.5			489.8			(72.1		)	810.1
	Gross profit	—			11.7			20.5			108.5			—			140.7
	Selling, general and administrative expenses	—			55			—			9			—			64
	Operating income (loss)	—			(43.3		)	20.5			99.5			—			76.7
	Non-operating income (expense), net	—			(25.8		)	2			(1.4		)	—			(25.2		)
	Income (loss) before income taxes	—			(69.1		)	22.5			98.1			—			51.5
	Income tax expense	—			6.6			0.1			0.8			—			7.5
	Earnings (loss) from equity in subsidiaries	44			63.9			(9.1		)	—			(98.8		)	—
	Net income (loss) before royalties and dividends	44			(11.8		)	13.3			97.3			(98.8		)	44
	Royalties and dividends	—			55.8			—			(55.8		)	—			—
	Net income after royalties and dividends	44			44			13.3			41.5			(98.8		)	44
	Other comprehensive loss	(25.2		)	(25.2		)	(19.0		)	(22.2		)	66.4			(25.2		)
	Comprehensive income (loss)	$	18.8		$	18.8		$	(5.7	)	$	19.3		$	(32.4	)	$	18.8
	Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
2013
Net sales
External	$	—		$	574.2		$	170.5		$	1,631.30		$	—		$	2,376.00
Intercompany	—			13			169.1			9			(191.1		)	—
Total net sales	—			587.2			339.6			1,640.30			(191.1		)	2,376.00
Cost of goods sold	—			566.3			293.3			1,355.70			(191.1		)	2,024.20
Gross profit	—			20.9			46.3			284.6			—			351.8
Selling, general and administrative expenses	—			149.3			—			28.6			—			177.9
Operating income (loss)	—			(128.4		)	46.3			256			—			173.9
Non-operating income (expense), net	—			(101.4		)	7.9			(6.6		)	—			(100.1		)
Income (loss) before income taxes	—			(229.8		)	54.2			249.4			—			73.8
Income tax expense (benefit)	—			(13.0		)	—			22.1			—			9.1
Earnings (loss) from equity in subsidiaries	64.7			115.6			(14.4		)	—			(165.9		)	—
Net income (loss) before royalties and dividends	64.7			(101.2		)	39.8			227.3			(165.9		)	64.7
Royalties and dividends	—			165.9			—			(165.9		)	—			—
Net income after royalties and dividends	64.7			64.7			39.8			61.4			(165.9		)	64.7
Other comprehensive loss	(0.8		)	(0.8		)	(14.4		)	(17.8		)	33			(0.8		)
Comprehensive income	$	63.9		$	63.9		$	25.4		$	43.6		$	(132.9	)	$	63.9
Supplemental Guarantor Consolidating Balance Sheet [Table Text Block]
	Condensed Consolidating Balance Sheets
	(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	September 30, 2014	(a)			(b)						(c)
	Assets
	Current assets
	Cash and cash equivalents	$	—		$	39.2		$	—		$	179.8		$	—		$	219
	Accounts receivable, net	—			164.3			28.6			407.3			—			600.2
	Intercompany receivables	—			170.9			164			10.1			(345.0		)	—
	Inventories, net	—			62.3			32.1			154.8			—			249.2
	Other current assets	—			39.9			3			67.9			—			110.8
	Total current assets	—			476.6			227.7			819.9			(345.0		)	1,179.20
	Property, plant and equipment, net	—			227			86.5			753.2			—			1,066.70
	Goodwill	—			—			147.9			7.7			—			155.6
	Intercompany notes and accounts receivable	—			327.3			216.8			—			(544.1		)	—
	Other assets and deferred charges	—			665			45.8			115.6			—			826.4
	Investment in subsidiaries	495			1,401.40			—			—			(1,896.4		)	—
	Total assets	$	495		$	3,097.30		$	724.7		$	1,696.40		$	(2,785.5	)	$	3,227.90
	Liabilities and stockholders’ equity
	Current liabilities
	Current portion of long-term debt	$	—		$	8.4		$	—		$	8.7		$	—		$	17.1
	Accounts payable	—			156			47.3			293			—			496.3
	Intercompany payables	—			153.7			125.2			62.2			(341.1		)	—
	Other current liabilities	—			117.4			5.4			102.3			—			225.1
	Total current liabilities	—			435.5			177.9			466.2			(341.1		)	738.5
	Intercompany notes and accounts payable	323.4			3.9			—			220.7			(548.0		)	—
	Long-term debt	—			1,485.90			5			34.6			—			1,525.50
	Investment in subsidiaries obligation	—			—			34.4			—			(34.4		)	—
	Other long-term liabilities	—			677			0.6			114.7			—			792.3
	Total liabilities	323.4			2,602.30			217.9			836.2			(923.5		)	3,056.30
	Total stockholders’ equity	171.6			495			506.8			860.2			(1,862.0		)	171.6
	Total liabilities and stockholders’ equity	$	495		$	3,097.30		$	724.7		$	1,696.40		$	(2,785.5	)	$	3,227.90
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	December 31, 2013
	Assets
	Current assets
	Cash and cash equivalents	$	—		$	36.9		$	—		$	117.1		$	—		$	154
	Accounts receivable, net	—			102.7			25.6			330.2			—			458.5
	Intercompany receivables	—			180.5			116.6			9.2			(306.3		)	—
	Inventories, net	—			62.4			34.2			165.2			—			261.8
	Other current assets	—			43.8			3.2			75			—			122
	Total current assets	—			426.3			179.6			696.7			(306.3		)	996.3
	Property, plant and equipment, net	—			239.8			83			735.7			—			1,058.50
	Goodwill	—			—			147.8			8.6			—			156.4
	Intercompany notes and accounts receivable	—			327			201.5			—			(528.5		)	—
	Other assets and deferred charges	—			671.7			44.8			99.8			—			816.3
	Investment in subsidiaries	363.7			1,240.10			—			—			(1,603.8		)	—
	Total assets	$	363.7		$	2,904.90		$	656.7		$	1,540.80		$	(2,438.6	)	$	3,027.50
	Liabilities and stockholders’ equity
	Current liabilities
	Accounts payable	$	—		$	106.2		$	44.5		$	286.7		$	—		$	437.4
	Intercompany payables	—			117.4			98.6			90.3			(306.3		)	—
	Other current liabilities	—			120.4			4.1			96.8			—			221.3
	Total current liabilities	—			344			147.2			473.8			(306.3		)	658.7
	Intercompany notes and accounts payable	323.2			3.7			—			201.6			(528.5		)	—
	Long-term debt	—			1,500.00			5.3			53.8			—			1,559.10
	Investment in subsidiaries obligation	—			—			15.2			—			(15.2		)	—
	Other long-term liabilities	—			693.5			0.5			75.2			—			769.2
	Total liabilities	323.2			2,541.20			168.2			804.4			(850.0		)	2,987.00
	Total stockholders’ equity	40.5			363.7			488.5			736.4			(1,588.6		)	40.5
	Total liabilities and stockholders’ equity	$	363.7		$	2,904.90		$	656.7		$	1,540.80		$	(2,438.6	)	$	3,027.50
Supplemental Guarantor Consolidating Statement of Cash Flows [Table Text Block]
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2013
	Net cash provided by (used in) operating activities	$	0.6		$	(55.4	)	$	46.8		$	110.3		$	—		$	102.3
	Investing activities
	Purchases of property, plant and equipment	—			(43.6		)	(7.0		)	(127.6		)	—			(178.2		)
	Proceeds from sale of property, plant and equipment	—			4.9			0.5			0.4			—			5.8
	Proceeds from sale-leaseback of equipment	—			23.5			—			—			—			23.5
	Intercompany activity							(40.1		)				40.1			—
	Net cash used in investing activities	—			(15.2		)	(46.6		)	(127.2		)	40.1			(148.9		)
	Financing activities
	Net debt activity	—			97			(0.2		)	19			—			115.8
	Debt issuance costs	—			(12.9		)	—			—			—			(12.9		)
	Employee stock option exercises	—			0.8			—			—			—			0.8
	Purchase of treasury stock	(0.4		)	—			—			—			—			(0.4		)
	Intercompany activity	(0.2		)	0.2			—			40.1			(40.1		)	—
	Net cash provided by (used in) financing activities	(0.6		)	85.1			(0.2		)	59.1			(40.1		)	103.3
	Effect of exchange rate changes on cash	—			—			—			(0.5		)	—			(0.5		)
	Net increase in cash and cash equivalents	—			14.5			—			41.7			—			56.2
	Cash and cash equivalents at beginning of period	—			10.6			—			51.8			—			62.4
	Cash and cash equivalents at end of period	$	—		$	25.1		$	—		$	93.5		$	—		$	118.6
	Condensed Consolidating Statements of Cash Flows
	Nine Months Ended September 30,
	(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2014
	Net cash provided by (used in) operating activities	$	(0.1	)	$	32.6		$	33.1		$	166		$	—		$	231.6
	Investing activities
	Purchases of property, plant and equipment	—			(32.7		)	(13.7		)	(109.8		)	—			(156.2		)
	Proceeds from sale of property, plant and equipment	—			7.8			0.2			0.5			—			8.5
	Intercompany activity	—			—			(19.3		)	—			19.3			—
	Net cash used in investing activities	—			(24.9		)	(32.8		)	(109.3		)	19.3			(147.7		)
	Financing activities
	Net debt activity	—			(5.9		)	(0.3		)	(10.5		)	—			(16.7		)
	Debt issuance costs	—			(0.3		)	—			—			—			(0.3		)
	Employee stock option exercises	—			1.2			—			—			—			1.2
	Purchase of treasury stock	(0.3		)	—			—			—			—			(0.3		)
	Intercompany activity	0.4			(0.4		)	—			19.3			(19.3		)	—
	Net cash provided by (used in) financing activities	0.1			(5.4		)	(0.3		)	8.8			(19.3		)	(16.1		)
	Effect of exchange rate changes on cash	—			—			—			(2.8		)	—			(2.8		)
	Net increase in cash and cash equivalents	—			2.3			—			62.7			—			65
	Cash and cash equivalents at beginning of period	—			36.9			—			117.1			—			154
	Cash and cash equivalents at end of period	$	—		$	39.2		$	—		$	179.8		$	—		$	219

Organization_and_Basis_of_Pres3

Organization and Basis of Presentation Revenue Recognition (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$22.20	$17
Deferred revenue	101.4	76.4
Increase Installed Capacity and Adjust Product Mix [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Additions	34.4
Deferred Revenue, Revenue Recognized	3.9
Deferred revenue	7.2
Deferred revenue	23.3
Delay of a Major Product Program [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Additions	9
Deferred Revenue, Revenue Recognized	0.3
Deferred revenue	1.1
Deferred revenue	7.9
Cash [Member] | Increase Installed Capacity and Adjust Product Mix [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Additions	27.5
Cash [Member] | Delay of a Major Product Program [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Additions	9.3
Trade Accounts Receivable [Member] | Increase Installed Capacity and Adjust Product Mix [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Additions	$6.90

Organization_and_Basis_of_Pres4

Organization and Basis of Presentation Revision of Prior Period Financial Statements (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2011
Cost of goods sold	$810.10	$695.50	$2,344.90	$2,024.20
Gross Profit	140.7	125.3	411.6	351.8
Operating Income (Loss)	76.7	67.5	229	173.9
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	51.5	37.7	155.6	73.8
Income tax expense	-7.5	-6.1	-25.8	-9.1
Net income	-44	-31.6	-129.8	-64.7
Basic earnings per share	$0.57	$0.41	$1.68	$0.84
Diluted earnings per share	$0.57	$0.41	$1.68	$0.84
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	18.8	48.6	123.1	63.9
Increase (Decrease) in Deferred Income Taxes			-6.8	1.3
Accounts payable and accrued expenses			68.4	111
Prepaid expenses and other current assets	-110.8		-110.8		-122
Assets, Current	1,179.20		1,179.20		996.3
Assets	3,227.90		3,227.90		3,027.50
Accumulated deficit	-44.6		-44.6		-174.4
Accounts payable	-496.3		-496.3		-437.4
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	171.6		171.6		40.5
Liabilities and Equity	3,227.90		3,227.90		3,027.50
Liabilities, Current	738.5		738.5		658.7
Liabilities	3,056.30		3,056.30		2,987
As previously reported
Cost of goods sold	801.7		2,336.50
Gross Profit	149.1		420
Operating Income (Loss)	85.1		237.4
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	59.9		164
Income tax expense	-11.3		-29.6
Net income	-48.6		-134.4
Basic earnings per share	$0.63		$1.74
Diluted earnings per share	$0.63		$1.74
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	23.4		127.7
Increase (Decrease) in Deferred Income Taxes			10.5
Accounts payable and accrued expenses			60
Prepaid expenses and other current assets	-108.5		-108.5		-123.5
Assets, Current	1,176.90		1,176.90		997.8
Assets	3,225.60		3,225.60		3,029
Accumulated deficit	-46.9		-46.9		-181.3
Accounts payable					-445.8
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	169.3		169.3		33.6
Liabilities and Equity	3,225.60		3,225.60
Liabilities, Current					667.1
Liabilities					2,995.40
Adjustment
Cost of goods sold	8.4		8.4
Gross Profit	-8.4		-8.4
Operating Income (Loss)	-8.4		-8.4
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	-8.4		-8.4
Income tax expense	3.8		3.8
Net income	4.6		4.6
Basic earnings per share	($0.06)		($0.06)
Diluted earnings per share	($0.06)		($0.06)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	-4.6		-4.6
Increase (Decrease) in Deferred Income Taxes			-3.8
Accounts payable and accrued expenses			8.4
Prepaid expenses and other current assets	-2.3		-2.3		1.5
Assets, Current	2.3		2.3		-1.5
Assets	2.3		2.3		-1.5
Accumulated deficit	2.3		2.3
Accounts payable					8.4
Accumulated deficit					6.9	6.9
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2.3		2.3		6.9
Liabilities and Equity	2.3		2.3
Liabilities, Current					-8.4
Liabilities					-8.4
As revised
Cost of goods sold	810.1		2,344.90
Gross Profit	140.7		411.6
Operating Income (Loss)	76.7		229
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	51.5		155.6
Income tax expense	-7.5		-25.8
Net income	-44		-129.8
Basic earnings per share	$0.57		$1.68
Diluted earnings per share	$0.57		$1.68
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	18.8		123.1
Increase (Decrease) in Deferred Income Taxes			6.7
Accounts payable and accrued expenses			68.4
Prepaid expenses and other current assets	-110.8		-110.8		-122
Assets, Current	1,179.20		1,179.20		996.3
Assets	3,227.90		3,227.90		3,027.50
Accumulated deficit	-44.6		-44.6		-174.4
Accounts payable					-437.4
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	171.6		171.6		40.5
Liabilities and Equity	3,227.90		3,227.90
Liabilities, Current					658.7
Liabilities					$2,987

Inventories_Details

Inventories (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Raw materials and work-in-progress	$252.40	$263.40
Finished goods	29.1	25.7
Gross inventories	281.5	289.1
Inventory valuation reserves	-32.3	-27.3
Inventories, net	$249.20	$261.80

LongTerm_Debt_Details

Long-Term Debt (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Mar. 31, 2013	Mar. 20, 2013
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$1,542.60		$1,542.60		$1,559.10
Long-term debt	1,525.50		1,525.50		1,559.10
Payments of debt issuance costs			0.3	12.9
Debt refinancing and redemption costs	0	0	0	11.2
Long-term debt, weighted average interest rate	6.40%		6.40%		6.30%
Current portion of long-term debt	17.1		17.1		0
6.25% Notes [Member]
Debt Instrument [Line Items]
Payments of debt issuance costs				6.6
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	0		0		0
Line of credit facility, maximum borrowing capacity	523.5		523.5
Line of credit facility, remaining borrowing capacity	505.5		505.5
Secured Debt [Member] | Loans Payable [Member]
Debt Instrument [Line Items]
Notes payable	144.4		144.4		150
Debt Instrument, Periodic Payment, Principal			5.6
Secured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Payments of debt issuance costs			0.1
Secured Debt [Member] | 9.25% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	9.25%		9.25%
Debt instrument, redemption amount					190
Unsecured Debt [Member] | 7.875% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	7.88%		7.88%
Debt Instrument, Tender and Redemption Premiums						8.5
Professional Fees						0.1
Write off of Deferred Debt Issuance Cost						2.1
Debt instrument, decrease, repayments						300
Unsecured Debt [Member] | 5.125% Notes [Member]
Debt Instrument [Line Items]
Notes payable	200		200		200
Debt instrument, interest rate, stated percentage	5.13%		5.13%
Payments of debt issuance costs			0.2
Unsecured Debt [Member] | 7.75% Notes [Member]
Debt Instrument [Line Items]
Notes payable	200		200		200
Unsecured Debt [Member] | 6.625% Notes [Member]
Debt Instrument [Line Items]
Notes payable	550		550		550
Unsecured Debt [Member] | 6.25% Notes [Member]
Debt Instrument [Line Items]
Notes payable	400		400		400
Debt instrument, interest rate, stated percentage	6.25%		6.25%
Foreign Credit Facilities [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	43.2		43.2		53.8
Notes payable	43.2		43.2
Debt instrument, unused borrowing capacity, amount	49.2		49.2
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations	5		5		5.3
Class C [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost						0.5
Line of credit facility, reduction in borrowing capacity, termination of loan facility							72.8
Class D [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, standby letters of credit issued against the facility	$18		$18

Fair_Value_of_Assets_and_Liabi

Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other cash equivalents, at carrying value	$33.70	$6.10
Portion at Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, fair value disclosure	33.7	6.1
Other Current Assets [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract, asset, fair value disclosure	0.3	0.7
Other Current Assets [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contract, asset, fair value disclosure	0.3	0.7
Accrued Liabilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure	1	0.4
Accrued Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure	1	0.4
Other Noncurrent Liabilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0.3	0
Other Noncurrent Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure	$0.30	$0

Fair_Value_of_Debt_Details

Fair Value of Debt (Details) (Fair Value, Inputs, Level 2 [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Revolving Credit Facility [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$0	$0
Revolving Credit Facility [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0	0
Loans Payable [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	144.4	150
Loans Payable [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	142.9	147.8
7.75% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	200	200
7.75% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	221	227.5
6.625% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	550	550
6.625% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	577.1	578.9
6.25% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	400	400
6.25% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	412	423
5.125% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	200	200
5.125% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$198.50	$206

Derivatives_Details

Derivatives (Details) (Forward Contracts [Member], USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$89.70		$89.70
Cost of Sales [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, income statement location of gain (loss) reclassified from accumulated OCI			Cost of Goods Sold
Derivative instruments, gain (loss) reclassified from accumulated OCI into income, effective portion, net	0.5	0.5	0.7	2.6
Cash flow hedge gain to be reclassified within twelve months					($0.50)

Employee_Benefit_Plans_Compone

Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Acceleration of Prior Service Cost due to remeasurement	$4.70
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.8	0.9	2.7	2.6
Interest cost	8.5	9	27	25.5
Expected asset return	-11.5	-12.1	-36.3	-34.5
Amortized loss	2.2	1.3	3.9	7
Amortized prior service cost (credit)	4.8	0	0	5.4
Net periodic benefit cost (credit)	4.8	-0.9	-2.7	6
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.1	0.1	0.3	0.3
Interest cost	3.3	3.8	11.4	9.9
Amortized loss	0.2	0.2	0.6	0.6
Amortized prior service cost (credit)	-0.4	-0.7	-2.1	-1.3
Net periodic benefit cost	3.2	3.4	10.2	9.5
Scenario, Forecast [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, estimated future employer contributions in current fiscal year					$17

Product_Warranties_Details

Product Warranties (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Product Warranty Rollforward
Beginning balance	$18.20	$23.20	$14.30	$29.10
Accruals	0.9	3.2	7.3	8.9
Settlements	-0.2	-0.1	-1.2	-10.6
Adjustments to prior period accruals, net	-2.2	-6.9	-3.8	-7.8
Foreign currency translation	-0.2	0	-0.1	-0.2
Ending balance	$16.50	$19.40	$16.50	$19.40

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Income tax expense	$7.50	$6.10		$25.80	$9.10
Effective income tax rate, continuing operations	14.60%	16.10%		16.60%	12.30%
Unrecognized tax benefits, reductions resulting from lapse of applicable statute of limitations			1.5
Income tax expense (benefit), other		0			3.3
Unrecognized tax benefits, decreases resulting from settlements with taxing authorities					$4.70

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator
Net income	$44	$31.60	$129.80	$64.70
Denominator
Basic shares outstanding - weighted-average shares outstanding	77.4	76.9	77.2	76.6
Effect of dilutive securities - dilutive stock-based compensation	0.2	0.1	0.2	0.1
Diluted shares outstanding - adjusted weighted-average shares after assumed conversion	77.6	77	77.4	76.7
Basic EPS	$0.57	$0.41	$1.68	$0.84
Diluted EPS	$0.57	$0.41	$1.68	$0.84
Antidilutive securities excluded from computation of earnings per share, amount			0.5	2
Earnings per share, range of exercise prices of Stock Options excluded from the calculation of diluted EPS, lower end of range	$19.54	$19.54	$19.54	$19.54
Earnings per share, range of exercise prices of Stock Options excluded from the calculation of diluted EPS, upper end of range	$26.65	$40.83	$26.65	$40.83

Reclassifications_out_of_Accum2

Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Defined benefit plans	($191.60)	($258.80)	($191.60)	($258.80)	($192.20)	($197.90)	($273.90)	($274.50)
Defined benefit plans, other comprehensive income (loss), before reclassifications	0	10.7	4.5	8
Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss)	0.6	4.4	1.8	7.7
Defined benefit plans, net current period other comprehensive income (loss)	0.6	15.1	6.3	15.7
Foreign currency translation adjustments	-30.5	-6.7	-30.5	-6.7	-7.2	-18.6	-9.2	7.6
Foreign currency translation adjustments, other comprehensive income (loss) arising during period, net of tax	-23.3	2.5	-11.9	-14.3
Foreign currency translation adjustments, other comprehensive income (loss), reclassification adjustment, net of tax	0	0	0	0
Foreign currency translation adjustments	-23.3	2.5	-11.9	-14.3
Unrecognized gain (loss) on derivatives	-0.8	0.1	-0.8	0.1	1.7	0.3	0.7	2.3
Unrecognized gain on derivatives, other comprehensive income (loss) arising during period, net of tax	-2	-0.1	-0.4	0.4
Unrecognized gain on derivatives, other comprehensive income (loss), reclassification adjustment, net of tax	-0.5	-0.5	-0.7	-2.6
Change in derivatives	-2.5	-0.6	-1.1	-2.2
Accumulated other comprehensive income (loss), net of tax	-222.9	-265.4	-222.9	-265.4	-197.7	-216.2	-282.4	-264.6
Other comprehensive income (loss) arising during period, total, net of tax	-25.3	13.1	-7.8	-5.9
Other comprehensive income (loss), reclassification adjustments, total, net of tax	0.1	3.9	1.1	5.1
Other comprehensive income (loss)	-25.2	17	-6.7	-0.8
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	-0.3	-2.3	-0.8	-4
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax	0	-5.6	-2.4	-4
Cost of Sales [Member]
Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss)	0.8	1.2	2.5	3.5
Selling, General and Administrative Expenses [Member]
Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss)	($0.20)	$3.20	($0.80)	$4.20

Supplemental_Guarantor_Condens2

Supplemental Guarantor Condensed Consolidating Financial Statements Supplemental Guarantor Condensed Consolidating Financial Statements Parenthetical (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Cost of goods sold	$810.10	$695.50	$2,344.90	$2,024.20
Income tax expense	7.5	6.1	25.8	9.1
Investment in subsidiaries	0		0		0
Other current assets	110.8		110.8		122
Earnings (loss) from equity in subsidiaries	0	0	0	0
As previously reported
Cost of goods sold	801.7		2,336.50
Income tax expense	11.3		29.6
Adjustment
Cost of goods sold	8.4		8.4
Income tax expense	-3.8		-3.8
AAM Inc. [Member]
Cost of goods sold	291.9	170.1	812.3	566.3
Income tax expense	6.6	0.9	13.4	-13
Investment in subsidiaries	1,401.40		1,401.40		1,240.10
Other current assets	39.9		39.9		43.8
Earnings (loss) from equity in subsidiaries	63.9	50.7	186.7	115.6
AAM Inc. [Member] | As previously reported
Investment in subsidiaries	1,399.10		1,399.10
Earnings (loss) from equity in subsidiaries	68.5		191.3
AAM Inc. [Member] | Adjustment
Investment in subsidiaries	2.3		2.3
Earnings (loss) from equity in subsidiaries	-4.6		-4.6
Holdings [Member]
Cost of goods sold	0	0	0	0
Income tax expense	0	0	0	0
Investment in subsidiaries	495		495		363.7
Other current assets	0		0		0
Earnings (loss) from equity in subsidiaries	44	31.6	129.8	64.7
Holdings [Member] | As previously reported
Investment in subsidiaries	492.7		492.7
Earnings (loss) from equity in subsidiaries	48.6		134.4
Holdings [Member] | Adjustment
Investment in subsidiaries	2.3		2.3
Earnings (loss) from equity in subsidiaries	-4.6		-4.6
Non-Guarantor Subsidiaries [Member]
Cost of goods sold	489.8	490.1	1,440.10	1,355.70
Income tax expense	0.8	5.2	12.1	22.1
Investment in subsidiaries	0		0		0
Other current assets	67.9		67.9		75
Earnings (loss) from equity in subsidiaries	0	0	0	0
Non-Guarantor Subsidiaries [Member] | As previously reported
Cost of goods sold	481.4		1,431.70
Income tax expense	4.6		15.9
Other current assets	65.6		65.6
Non-Guarantor Subsidiaries [Member] | Adjustment
Cost of goods sold	8.4		8.4
Income tax expense	-3.8		-3.8
Other current assets	$2.30		$2.30

Supplemental_Guarantor_Condens3

Supplemental Guarantor Condensed Consolidating Statements of Income (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net sales
External	$950.80	$820.80	$2,756.50	$2,376
Intercompany	0	0	0	0
Total net sales	950.8	820.8	2,756.50	2,376
Cost of goods sold	810.1	695.5	2,344.90	2,024.20
Gross profit	140.7	125.3	411.6	351.8
Selling, general and administrative expenses	64	57.8	182.6	177.9
Operating income (loss)	-76.7	-67.5	-229	-173.9
Non-operating income (expense), net	-25.2	-29.8	-73.4	-100.1
Income (loss) before income taxes	51.5	37.7	155.6	73.8
Income tax expense	7.5	6.1	25.8	9.1
Earnings (loss) from equity in subsidiaries	0	0	0	0
Net income (loss) before royalties and dividends	44	31.6	129.8	64.7
Royalties and dividends	0	0	0	0
Net income after royalties and dividends	44	31.6	129.8	64.7
Other comprehensive income (loss)	-25.2	17	-6.7	-0.8
Comprehensive income (loss)	18.8	48.6	123.1	63.9
Holdings [Member]
Net sales
External	0	0	0	0
Intercompany	0	0	0	0
Total net sales	0	0	0	0
Cost of goods sold	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Operating income (loss)	0	0	0	0
Non-operating income (expense), net	0	0	0	0
Income (loss) before income taxes	0	0	0	0
Income tax expense	0	0	0	0
Earnings (loss) from equity in subsidiaries	44	31.6	129.8	64.7
Net income (loss) before royalties and dividends	44	31.6	129.8	64.7
Royalties and dividends	0	0	0	0
Net income after royalties and dividends	44	31.6	129.8	64.7
Other comprehensive income (loss)	-25.2	17	-6.7	-0.8
Comprehensive income (loss)	18.8	48.6	123.1	63.9
AAM Inc. [Member]
Net sales
External	300.9	162.6	826.8	574.2
Intercompany	2.7	5	8.5	13
Total net sales	303.6	167.6	835.3	587.2
Cost of goods sold	291.9	170.1	812.3	566.3
Gross profit	11.7	-2.5	23	20.9
Selling, general and administrative expenses	55	48.1	155.6	149.3
Operating income (loss)	43.3	50.6	132.6	128.4
Non-operating income (expense), net	-25.8	-30.6	-77.5	-101.4
Income (loss) before income taxes	-69.1	-81.2	-210.1	-229.8
Income tax expense	6.6	0.9	13.4	-13
Earnings (loss) from equity in subsidiaries	63.9	50.7	186.7	115.6
Net income (loss) before royalties and dividends	-11.8	-31.4	-36.8	-101.2
Royalties and dividends	55.8	63	166.6	165.9
Net income after royalties and dividends	44	31.6	129.8	64.7
Other comprehensive income (loss)	-25.2	17	-6.7	-0.8
Comprehensive income (loss)	18.8	48.6	123.1	63.9
Guarantor Subsidiaries [Member]
Net sales
External	56.9	57.8	174	170.5
Intercompany	64.1	55.2	184.7	169.1
Total net sales	121	113	358.7	339.6
Cost of goods sold	100.5	97.2	303	293.3
Gross profit	20.5	15.8	55.7	46.3
Selling, general and administrative expenses	0	0	0.1	0
Operating income (loss)	-20.5	-15.8	-55.6	-46.3
Non-operating income (expense), net	2	2.5	7.2	7.9
Income (loss) before income taxes	22.5	18.3	62.8	54.2
Income tax expense	0.1	0	0.3	0
Earnings (loss) from equity in subsidiaries	-9.1	-1.5	-25.1	-14.4
Net income (loss) before royalties and dividends	13.3	16.8	37.4	39.8
Royalties and dividends	0	0	0	0
Net income after royalties and dividends	13.3	16.8	37.4	39.8
Other comprehensive income (loss)	-19	-0.8	-7.9	-14.4
Comprehensive income (loss)	-5.7	16	29.5	25.4
Non-Guarantor Subsidiaries [Member]
Net sales
External	593	600.4	1,755.70	1,631.30
Intercompany	5.3	1.7	17.3	9
Total net sales	598.3	602.1	1,773	1,640.30
Cost of goods sold	489.8	490.1	1,440.10	1,355.70
Gross profit	108.5	112	332.9	284.6
Selling, general and administrative expenses	9	9.7	26.9	28.6
Operating income (loss)	-99.5	-102.3	-306	-256
Non-operating income (expense), net	-1.4	-1.7	-3.1	-6.6
Income (loss) before income taxes	98.1	100.6	302.9	249.4
Income tax expense	0.8	5.2	12.1	22.1
Earnings (loss) from equity in subsidiaries	0	0	0	0
Net income (loss) before royalties and dividends	97.3	95.4	290.8	227.3
Royalties and dividends	-55.8	-63	-166.6	-165.9
Net income after royalties and dividends	41.5	32.4	124.2	61.4
Other comprehensive income (loss)	-22.2	-1.7	-10.7	-17.8
Comprehensive income (loss)	19.3	30.7	113.5	43.6
Elims [Member]
Net sales
External	0	0	0	0
Intercompany	-72.1	-61.9	-210.5	-191.1
Total net sales	-72.1	-61.9	-210.5	-191.1
Cost of goods sold	-72.1	-61.9	-210.5	-191.1
Gross profit	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Operating income (loss)	0	0	0	0
Non-operating income (expense), net	0	0	0	0
Income (loss) before income taxes	0	0	0	0
Income tax expense	0	0	0	0
Earnings (loss) from equity in subsidiaries	-98.8	-80.8	-291.4	-165.9
Net income (loss) before royalties and dividends	-98.8	-80.8	-291.4	-165.9
Royalties and dividends	0	0	0	0
Net income after royalties and dividends	-98.8	-80.8	-291.4	-165.9
Other comprehensive income (loss)	66.4	-14.5	25.3	33
Comprehensive income (loss)	($32.40)	($95.30)	($266.10)	($132.90)

Supplemental_Guarantor_Condens4

Supplemental Guarantor Condensed Consolidating Balance Sheets (Details) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Current Assets
Cash and cash equivalents	$219	$219	$154	$118.60	$62.40
Accounts receivable, net	600.2		458.5
Intercompany Receivables	0		0
Inventories, net	249.2		261.8
Other current assets	110.8		122
Total current assets	1,179.20		996.3
Property, plant and equipment, net	1,066.70		1,058.50
Goodwill	155.6		156.4
Intercompany notes and accounts receivable	0		0
Other assets and deferred charges	826.4		816.3
Investment in subsidiaries	0		0
Total assets	3,227.90		3,027.50
Current Liabilities
Current portion of long-term debt	17.1		0
Accounts payable	496.3		437.4
Intercompany Payables	0		0
Other current liabilities	225.1		221.3
Total current liabilities	738.5		658.7
Intercompany notes and accounts payable	0		0
Long-term debt	1,525.50		1,559.10
Investment in subsidiaries obligation	0		0
Other long-term liabilities	792.3		769.2
Total liabilities	3,056.30		2,987
Total stockholders’ equity	171.6		40.5
Total liabilities and stockholders' equity	3,227.90		3,027.50
Holdings [Member]
Current Assets
Cash and cash equivalents	0	0	0	0	0
Accounts receivable, net	0		0
Intercompany Receivables	0		0
Inventories, net	0		0
Other current assets	0		0
Total current assets	0		0
Property, plant and equipment, net	0		0
Goodwill	0		0
Intercompany notes and accounts receivable	0		0
Other assets and deferred charges	0		0
Investment in subsidiaries	495		363.7
Total assets	495		363.7
Current Liabilities
Current portion of long-term debt	0
Accounts payable	0		0
Intercompany Payables	0		0
Other current liabilities	0		0
Total current liabilities	0		0
Intercompany notes and accounts payable	323.4		323.2
Long-term debt	0		0
Investment in subsidiaries obligation	0		0
Other long-term liabilities	0		0
Total liabilities	323.4		323.2
Total stockholders’ equity	171.6		40.5
Total liabilities and stockholders' equity	495		363.7
AAM Inc. [Member]
Current Assets
Cash and cash equivalents	39.2	39.2	36.9	25.1	10.6
Accounts receivable, net	164.3		102.7
Intercompany Receivables	170.9		180.5
Inventories, net	62.3		62.4
Other current assets	39.9		43.8
Total current assets	476.6		426.3
Property, plant and equipment, net	227		239.8
Goodwill	0		0
Intercompany notes and accounts receivable	327.3		327
Other assets and deferred charges	665		671.7
Investment in subsidiaries	1,401.40		1,240.10
Total assets	3,097.30		2,904.90
Current Liabilities
Current portion of long-term debt	8.4
Accounts payable	156		106.2
Intercompany Payables	153.7		117.4
Other current liabilities	117.4		120.4
Total current liabilities	435.5		344
Intercompany notes and accounts payable	3.9		3.7
Long-term debt	1,485.90		1,500
Investment in subsidiaries obligation	0		0
Other long-term liabilities	677		693.5
Total liabilities	2,602.30		2,541.20
Total stockholders’ equity	495		363.7
Total liabilities and stockholders' equity	3,097.30		2,904.90
Guarantor Subsidiaries [Member]
Current Assets
Cash and cash equivalents	0	0	0	0	0
Accounts receivable, net	28.6		25.6
Intercompany Receivables	164		116.6
Inventories, net	32.1		34.2
Other current assets	3		3.2
Total current assets	227.7		179.6
Property, plant and equipment, net	86.5		83
Goodwill	147.9		147.8
Intercompany notes and accounts receivable	216.8		201.5
Other assets and deferred charges	45.8		44.8
Investment in subsidiaries	0		0
Total assets	724.7		656.7
Current Liabilities
Current portion of long-term debt	0
Accounts payable	47.3		44.5
Intercompany Payables	125.2		98.6
Other current liabilities	5.4		4.1
Total current liabilities	177.9		147.2
Intercompany notes and accounts payable	0		0
Long-term debt	5		5.3
Investment in subsidiaries obligation	34.4		15.2
Other long-term liabilities	0.6		0.5
Total liabilities	217.9		168.2
Total stockholders’ equity	506.8		488.5
Total liabilities and stockholders' equity	724.7		656.7
Non-Guarantor Subsidiaries [Member]
Current Assets
Cash and cash equivalents	179.8	179.8	117.1	93.5	51.8
Accounts receivable, net	407.3		330.2
Intercompany Receivables	10.1		9.2
Inventories, net	154.8		165.2
Other current assets	67.9		75
Total current assets	819.9		696.7
Property, plant and equipment, net	753.2		735.7
Goodwill	7.7		8.6
Intercompany notes and accounts receivable	0		0
Other assets and deferred charges	115.6		99.8
Investment in subsidiaries	0		0
Total assets	1,696.40		1,540.80
Current Liabilities
Current portion of long-term debt	8.7
Accounts payable	293		286.7
Intercompany Payables	62.2		90.3
Other current liabilities	102.3		96.8
Total current liabilities	466.2		473.8
Intercompany notes and accounts payable	220.7		201.6
Long-term debt	34.6		53.8
Investment in subsidiaries obligation	0		0
Other long-term liabilities	114.7		75.2
Total liabilities	836.2		804.4
Total stockholders’ equity	860.2		736.4
Total liabilities and stockholders' equity	1,696.40		1,540.80
Elims [Member]
Current Assets
Cash and cash equivalents	0	0	0	0	0
Accounts receivable, net	0		0
Intercompany Receivables	-345		-306.3
Inventories, net	0		0
Other current assets	0		0
Total current assets	-345		-306.3
Property, plant and equipment, net	0		0
Goodwill	0		0
Intercompany notes and accounts receivable	-544.1		-528.5
Other assets and deferred charges	0		0
Investment in subsidiaries	-1,896.40		-1,603.80
Total assets	-2,785.50		-2,438.60
Current Liabilities
Current portion of long-term debt	0
Accounts payable	0		0
Intercompany Payables	-341.1		-306.3
Other current liabilities	0		0
Total current liabilities	-341.1		-306.3
Intercompany notes and accounts payable	-548		-528.5
Long-term debt	0		0
Investment in subsidiaries obligation	-34.4		-15.2
Other long-term liabilities	0		0
Total liabilities	-923.5		-850
Total stockholders’ equity	-1,862		-1,588.60
Total liabilities and stockholders' equity	($2,785.50)		($2,438.60)

Supplemental_Guarantor_Condens5

Supplemental Guarantor Condensed Consolidating Statements of Cash Flows (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Net cash provided by (used in) operating activities	$231.60	$102.30
Investing activities
Purchases of property, plant and equipment	-156.2	-178.2
Proceeds from sale of property, plant and equipment	8.5	5.8
Intercompany Activity	0	0
Proceeds from sale-leaseback of equipment	0	23.5
Net cash used in investing activities	-147.7	-148.9
Financing Activities
Net debt activity	-16.7	115.8
Debt issuance costs	-0.3	-12.9
Employee stock option exercises	1.2	0.8
Purchase of treasury stock	-0.3	-0.4
Intercompany Activity	0	0
Net cash provided by (used in) financing activities	-16.1	103.3
Effect of exchange rate changes on cash	-2.8	-0.5
Net increase in cash and cash equivalents	65	56.2
Cash and cash equivalents at beginning of period	154	62.4
Cash and cash equivalents at end of period	219	118.6
Holdings [Member]
Net cash provided by (used in) operating activities	-0.1	0.6
Investing activities
Purchases of property, plant and equipment	0	0
Proceeds from sale of property, plant and equipment	0	0
Intercompany Activity	0
Proceeds from sale-leaseback of equipment		0
Net cash used in investing activities	0	0
Financing Activities
Net debt activity	0	0
Debt issuance costs	0	0
Employee stock option exercises	0	0
Purchase of treasury stock	-0.3	-0.4
Intercompany Activity	0.4	-0.2
Net cash provided by (used in) financing activities	0.1	-0.6
Effect of exchange rate changes on cash	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
AAM Inc. [Member]
Net cash provided by (used in) operating activities	32.6	-55.4
Investing activities
Purchases of property, plant and equipment	-32.7	-43.6
Proceeds from sale of property, plant and equipment	7.8	4.9
Intercompany Activity	0
Proceeds from sale-leaseback of equipment		23.5
Net cash used in investing activities	-24.9	-15.2
Financing Activities
Net debt activity	-5.9	97
Debt issuance costs	-0.3	-12.9
Employee stock option exercises	1.2	0.8
Purchase of treasury stock	0	0
Intercompany Activity	-0.4	0.2
Net cash provided by (used in) financing activities	-5.4	85.1
Effect of exchange rate changes on cash	0	0
Net increase in cash and cash equivalents	2.3	14.5
Cash and cash equivalents at beginning of period	36.9	10.6
Cash and cash equivalents at end of period	39.2	25.1
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	33.1	46.8
Investing activities
Purchases of property, plant and equipment	-13.7	-7
Proceeds from sale of property, plant and equipment	0.2	0.5
Intercompany Activity	-19.3	-40.1
Proceeds from sale-leaseback of equipment		0
Net cash used in investing activities	-32.8	-46.6
Financing Activities
Net debt activity	-0.3	-0.2
Debt issuance costs	0	0
Employee stock option exercises	0	0
Purchase of treasury stock	0	0
Intercompany Activity	0	0
Net cash provided by (used in) financing activities	-0.3	-0.2
Effect of exchange rate changes on cash	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	166	110.3
Investing activities
Purchases of property, plant and equipment	-109.8	-127.6
Proceeds from sale of property, plant and equipment	0.5	0.4
Intercompany Activity	0
Proceeds from sale-leaseback of equipment		0
Net cash used in investing activities	-109.3	-127.2
Financing Activities
Net debt activity	-10.5	19
Debt issuance costs	0	0
Employee stock option exercises	0	0
Purchase of treasury stock	0	0
Intercompany Activity	19.3	40.1
Net cash provided by (used in) financing activities	8.8	59.1
Effect of exchange rate changes on cash	-2.8	-0.5
Net increase in cash and cash equivalents	62.7	41.7
Cash and cash equivalents at beginning of period	117.1	51.8
Cash and cash equivalents at end of period	179.8	93.5
Elims [Member]
Net cash provided by (used in) operating activities	0	0
Investing activities
Purchases of property, plant and equipment	0	0
Proceeds from sale of property, plant and equipment	0	0
Intercompany Activity	19.3	40.1
Proceeds from sale-leaseback of equipment		0
Net cash used in investing activities	19.3	40.1
Financing Activities
Net debt activity	0	0
Debt issuance costs	0	0
Employee stock option exercises	0	0
Purchase of treasury stock	0	0
Intercompany Activity	-19.3	-40.1
Net cash provided by (used in) financing activities	-19.3	-40.1
Effect of exchange rate changes on cash	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$0	$0